Maybe some of you have seen this, but it's something to keep in mind when bidding or posting on ebay:

http://www.marginalrevolution.com/ma...oney_on_e.html

Personally, I pay a lot of attention to shipping charges, but I think the point of the study is that it doesn't matter if an individual does that; the group of bidders bid earlier, and this can cause a bidding war and thus a higher price...

I also wonder if the category of bidder matters in this case: like maybe those who purchase certain kinds of items are more likely to resent inflated shipping charges. Maybe?