… if it looks too good to be true, it probably ain’t true…
There was a big ebay scam a while ago that a bunch of us piled onto:
(long read, but the end is that ebay finally figured out that the guy was a scammer and canceled almost everyone’s transactions. IIRC, a couple of people got burned because they didn’t jump through ebay’s hoops properly)
edit
oops, wrong thread. This is the one I meant: