I'm now avoiding buying/selling on eBay, unless it's something being sold by a fellow Apple collector.
My friend sold a nice antique truck mint complete in box for a friend of his. The buyer said it wasn't as pictured and tried to send back the same truck but it seemed (by the buyer's description of what was "wrong with it") to have been bought at a flea market (and no box/instructions).
My friend said no, then the guy not only wanted the money back, but not send back anything at all for his problems.
That made PayPal side with my friend, because it was very suspicious that the buyer just wanted his money back without sending anything back to the seller.
I'm afraid to sell my old DVD sets as well since I've heard horror stories that people would lie and complain about the DVD's (missing, scratched, bootlegs but they are retail ones), Paypal would side with the buyer and your out the money and the DVD's.
Now, I just trade in my old DVD's to a local store, less money, but at least I get something.