I had a problem with a bike I bought awhile ago on ebay. After my bid won and PayPal was made I was contacted by the seller saying he was a bike shop selling the bike for a customer, and the customer was really disappointed in the winning bid.

I just remained firm: he offered it for sale to the public, I bid, I won and I paid, its now my bike. Any problem he has with his customer is not my problem. First he tried to get more money, then he tried to cancel the deal. After a week back and forth with possible solutions and me refusing to budge he informed me he was shipping the bike for the winning price.