System, never. I either get what I want, or at least get it (360) at a good deal that I can't regret it.
Maybe some games, but that is usually more a regret that I don't have time to play them and then forget to finish them... I probably get at least 80% of games used, or after they dropped in price, or some sort of sale (such as buy 2 get 1 free). Less to regret when I get a good deal on a game...








