Just as bad as not paying are the ones that bid on auctions pushing up the prices and then either dont have the money or cant pay for a few weeks. that is taking the piss and only making money for the dealer or the owner. a few years ago before on line auctions there used to be a joker who would bid on every record in an auction knowing full well he would not be able to pay for them all the only result was he wass costing other genuine collectors money