Another thing that is frustrating is that lowballing is the only negotiation tactic some people know. I've set starting prices for saddles on eBay at $25 + shipping (which again was darn close to the historical market value) and no one will bid on the item but as soon as the auction is over, I'll get 3 or 4 emails offering to buy the saddle for $15 or $20 including shipping.
Of course, I put then put the same saddle up on eBay starting at $10 instead and once everyone starts "negotiating" against each other by bidding instead of negotiating against me, I typically get what I asked for originally anyway. If someone would make an offer in the ballpark, we could strike a deal but everyone wants to give you half of what it's worth.