I've just had two consecutive non-paying eBay bidders, on the same item. The last one spun me a line about a "problem" with his "profile page" when I asked why he hadn't paid after two days, which I don't know what that means, and that he would pay me "tomorrow". "Tomorrow" being yesterday. I had to cancel both with the option of "buyer not paid", but you can't even leave negative feedback now. So what happens to them, because from my side it seems that people can bid on things and then not pay with impunity.