Well, I just had the following experience: listed a brand new unopened Blackberry Bold 9700. Sweet! At the end of the auction, a bidder ran it up to $378 and won. Sweet! When I did not hear from him, I sent him an invoice. He wrote back and said "oh, I forgot I was bidding on two and can I not but yours." The asshole's ebay ID is Digging around ebay, they have a complicated process when this happens. In the end, I get refunded my listing and transaction fees. I have my Bold and no cash.
Then I tried to leave some comment so another buyer won't get screwed by this dufus. Nope. No way, no how. And here is what ebay had to say to me when I contacted them . . . .
Translation: IT IS ALL TO INCREASE BUYER CONFIDENCE, FUCK THE SELLER