Re: Would you buy a boat from eBay??
Zombie thread, but I'll add my input. I sold my last boat (18' ski boat) on eBay.
I welcomed buyers to look at it in person. Only one did, he didn't win.
I required a $200 deposit within several days of the end of the auction. If you didn't come to get it, non refundable. If you came to get it, and didn't like what you saw/thought I misrepresented, the deposit was refundable.
Payment due in full at the time of pickup.
I figured that this would make folks comfortable enough that if they won it, they could paypal me a small deposit, and if it wasn't what they were expecting they could walk away and even get their deposit back by dispute with paypal.
I feel this worked out well for both me and my buyer. If your potential seller doesn't offer similar safeguards (wants full or substantial payment at time of auction, doesn't invite people to look at it, etc) I would run.