Yup! I had this happen to me once. I bid what I expected to be a decent price for the item. As the waning minutes of the auction wound down, I was very happy to see that I would only have to pay a little over half of my maximum bid. Suddenly some guy from Italy with ZERO feedback started bidding like crazy and ran the total up to just a few dollars under my maximum bid. I won ofcourse, but was a bit upset with what happened.
Here's the scenario:
Somebody sets up an auction. Yes, the item is real, and the guy is real. What he does is setup a "mock" ID that can be verified with Ebay's automated system.
He then sets up a sniping program to watch the auction(s) and automatically bid up to a reasonable amount at the last minute. If the opposing bids outbid the program's maximum amount, then he's in the clear with a purchase for what he wanted to sell the item for in the first place.
If his mock account outbids the maximum opposing bids then all he has to do is go through the motions of paying himself which really means he does nothing but report a favorable feedback for the seller which is also a plus for him. Ebay doesn't monitor cashier checks, Bidpay transactions or money orders, so all they're concerned with is their fees for the auctions. The seller under these circumstances is not abliged to report a valid sale.
Sure, he loses the cost of the fees for the auction, but will make it up later when he reauctions the item and starts the process all over again.
Sooner or later he'll get his money back on the fees plus a profit because the items being auctioned are valuable enough to insure a high interest in the market. The means for pulling this off are not difficult at all.