Sold a laptop on ebay for parts as it was broken, apparently the buyer set up a fake auction and conneed someone into sending them money for a monitor they never intended on selling, they used the money generated from that scam to pay for my item. I recieved payment, everything seemed ok and then a few weeks later when I got more money into my account for another sale they pulled out the amount for the laptop and said that the charge was reversed...I called pay pal and they gave me no real reason as to why they did it other than there was something wrong with the funds, only through my investigative work did I discover what had happened. It took me nearly a month but I finally convinced pay pal that I should be covered under their protection agreement and they used that to refund my money. I have also had buyers try to extort me for shipping refunds through the threat of negative feedback (my account is all positive) I can only see that getting worse now.