small percentage of them. The problems I've encountered so far are these:

- buyer Photoshopped damage to try to get a partial refund (happened one time but people on this board helped me determine that the photos were altered)
- buyer won auction but didn't follow through with payment (happened twice)
- bidders based in countries that I don't ship to got through despite my setting up ebay buyer restrictions (this happened more often than the other issues but if see them before the auction ends I cancel their bids and block them from further bidding)