Good idea, but it doesn't solve the problem. A common ploy (not just in cue selling) is to do something like what Ideologist describes (claiming a bad shaft is original to the cue) and then when the buyer complains, say "Oh, I'm sorry - here's your refund." The problem with that is that many buyers won't notice and won't complain. In those instances the seller makes some extra bucks, but since he happily gives returns to those who catch him in his scam, he always has perfect feedback. If he gets away with it 9 out of 10 times, he's making a decent profit and everyone is happy, even those who got quick refunds. There is no way that I am aware of to beat such a selling strategy.