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Old 09-17-09, 06:37 AM   #1
PhilipCohen
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Shill Bidding on eBay: Case Study #2

Shill Bidding on eBay: Case Study #2

Shining some light on the more sophisticated and therefore harder to detect shill bidding activity by some “professional” sellers on eBay auctions

Not another case study on shill bidding on eBay auctions? Yes, sorry, another one. This time a spreadsheet analysis of multiple auctions from some "professional" sellers from the US and Australia. Needless to say the analysis demonstrates, once again, that, contrary to eBay's claims, shill bidding by many “professional” sellers is rampant on eBay auctions. The full comment and spreadsheet download links at:
http://www.auctionbytes.com/forum/ph...ic.php?t=24296
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Old 09-17-09, 07:06 AM   #2
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I don't get it. If someone originally felt the painting was worth $205 (and bid as such), how can you blame shill bidding for running up the price? The winner paid what he/she was willing to pay.

Secondly, how can a shill know where the magic price is where they won't "win" the auction as they nibble? Is this based on the interval of the next bid?
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Old 09-17-09, 08:00 AM   #3
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First of all, undisclosed vendor bidding is fraud.

An unscrupulous seller can ascertain your maximum proxy bid in two ways:
1. nibble away at the proxy bid until the proxy bid does not increment any further.
2, place a very high bid, become the highest bidder, see the maximum proxy bid, retract your high bid with excuse "wrong amount" and place new bid equal to or just below the max proxy bid.

It's as simple as that and believe me all the unscrupulous sellers know it (so does eBay); the more professional shills uses multiple IDs to be less obvious.

If you want an in-depth understanding you will have to read my detailed posts on auctionbytes.com.
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Old 09-17-09, 08:57 AM   #4
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I will alert you if I find someone who cares.
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Old 09-17-09, 09:37 AM   #5
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shill bidding? is that why an item I was bidding on the other night suddenly jumped form about $75 to 125$? I have always been curious about this. I know they prosecuted (or atleast tried to) some people in NY state a few years ago for something like this.

between worries about this and 'sniping' I seldom even bother bidding on ebay anylonger.
when I sell som ething and I would like $50 dollars for it I start the bidding at $40 if I only get $40 no big deal but why start at $1 and then have to cheat to get the amount higher.
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Old 09-17-09, 10:46 AM   #6
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What does this even have to do with General cycling? Seems more like a post from a disgruntled eBay user that lost too many auctions.
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Old 09-17-09, 11:57 AM   #7
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This is why I only buy things that have a decent "buy it now" price. Sure there's the possibility of getting something cheaper if you bid, but it's much more likely you either won't get it, or will end up paying more than the buy it now price anyhow.
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Old 09-17-09, 12:03 PM   #8
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What does this even have to do with General cycling? Seems more like a post from a disgruntled eBay user that lost too many auctions.
Agreed, it should be moved to the off topic forum.
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Old 09-17-09, 12:17 PM   #9
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Agreed, it should be moved to the off topic forum.
Agreed...
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Old 09-17-09, 12:25 PM   #10
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Can I bid against the move?
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Old 09-17-09, 12:27 PM   #11
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Isn't there a trash can somewhere so you don't litter up foo?
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Old 09-17-09, 12:29 PM   #12
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I, for one, thank you for this excellent, imformative post.
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Old 09-17-09, 12:33 PM   #13
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I, for one, thank you for this excellent, imformative post.
here, use this tp...you got something on the tip of your nose.
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Old 09-17-09, 12:35 PM   #14
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but it was a most excellent article.
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Old 09-17-09, 12:51 PM   #15
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but it was a most excellent article.
That changes the fact that it was dumped here, how?
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Old 09-17-09, 12:56 PM   #16
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That changes the fact that it was dumped here, how?

I prefer to think of it as the thread was relocated to bring maximum pleasure to a greater audience.
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Old 09-17-09, 12:58 PM   #17
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I prefer to think of it as the thread was relocated to bring maximum pleasure to a greater audience.
Well, we now know Airwick likes catching.
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Old 09-17-09, 12:59 PM   #18
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If a system can be corrupted for profit, people will find a way to expoit it. Putting that system online only shortens the timeline.

I gave up on Ebay long ago. Somehow, I've managed to survive without it.
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Old 09-17-09, 01:52 PM   #19
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It looks to me as if Mr. Cohen is just looking to direct us to his website. That is just footastic.
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Old 09-17-09, 02:14 PM   #20
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A+++++ will read again!!!!
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Old 09-17-09, 02:25 PM   #21
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shill bidding? is that why an item I was bidding on the other night suddenly jumped form about $75 to 125$? I have always been curious about this. I know they prosecuted (or atleast tried to) some people in NY state a few years ago for something like this.

between worries about this and 'sniping' I seldom even bother bidding on ebay anylonger.
when I sell som ething and I would like $50 dollars for it I start the bidding at $40 if I only get $40 no big deal but why start at $1 and then have to cheat to get the amount higher.
+1

I don't bother with ebay much anymore for the same reasons. I don't have time to sit in front of the computer in the last minutes of the auction in cases where there's no sniping. It's also frustrating to get sniped and I just don't want to set that up that kind of system for myself so I don't bother.
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Old 09-17-09, 02:38 PM   #22
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Quote:
Originally Posted by Bianchigirll View Post
shill bidding? is that why an item I was bidding on the other night suddenly jumped form about $75 to 125$? I have always been curious about this. I know they prosecuted (or atleast tried to) some people in NY state a few years ago for something like this.

between worries about this and 'sniping' I seldom even bother bidding on ebay anylonger.
when I sell som ething and I would like $50 dollars for it I start the bidding at $40 if I only get $40 no big deal but why start at $1 and then have to cheat to get the amount higher.
I think that can be legit. If the current high bid is $73, and someone comes along (Bidder B) and enters a max bid of $125, they will now be the high bidder at $75 (the next increment), but willing to go to $125. Now someone else comes along (Bidder C) and bids a max of $123. Bidder C instantly & automatically gets out bid by Bidder B's max of $125 and the item is now bid up to $125.
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Old 09-18-09, 01:21 AM   #23
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When I was bidding on ebay I was offered items several times as the second highest bidder apparently after the high bidder supposedly reneged on the deal. I often wondered if these were cases of shill bidding that did not work quite as intended.
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Old 09-18-09, 02:05 AM   #24
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You can put money on it that they were the result of failed attempts to shill bid you higher ...
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Old 09-18-09, 02:14 AM   #25
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this is why for new stuff ebay hardly ever beats the price on websites of other online retailers.
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