http://www.cbc.ca/canada/calgary/story/2007/12/03/ebay-hijack.html
Not really suprised at all the scams that are on ebay - I've been ripped off a couple of times on Ebay, but thankfully I paid through my credit card and was able to do chargebacks in each case.
I feel sorry for the guy in the article though - but he should've never wired $20k to a complete stranger.
I guess the moral of the story is - Buyer beware and know the process when buying big ticket items!