I remember reading a while ago (on here in fact) that some guy in the south sold a PPC to 3 different people and didn't send the card to either of them. They all managed to get the vast majority of their money back though, because they paid via paypal, which was good.
When I asked him about paypal he said that, although he has an account, it's not validated and he can't take money. Which is shame because paypal offer protection for this sort of thing.