I bought an engine, and an outdrive on separate auctions. Both deals worked out great. I couldn't have been happier.
Sold a boat on ebay, worked out well for both of us.
Sold two jet skis, or so I thought. After he won the auction, he wanted me to ship them to him. It plainly stated on the auction "as is, where is". At least ebay didn't charge me for the auction.