The only time I ever buy used is if I'm not willing to pay full price for a title. The stores that sell used around here have pretty solid return policies, and if a title is obscure enough, I can get it "used" for as low as $7.50 Cdn and the disc will look like it's never been touched. that was the case with Possession, The Importance of Being Earnest, and Eight Legged Freaks.