While not a non-paying bidder (yet), I had an auction that shortly before it ended, someone who was interested sent me a message asking if he won, could I wait until Feb. 6 for him to pay. I didn't see the message until after the auction was over and so didn't have a chance to respond, but the guy bid anyway and ended up winning the auction. He confirmed that he might not be able to pay until Feb. 6. I'm tempted to tell him that he has 7 days to pay or I'm canceling the deal, but the way things are these days, he would pay in time, but be would be hacked off that I wasn't willing to wait a month and leave me a negative.