There is no question about the convenience of playing games off the hard drive. Whevenever I turn on the 360, I ususally just play an arcade game because I am too lazy to enter a disk (oh yeah, and the fact that the games out now suck). But the question is, who in their right mind would keep the disk that they never have to use it again. Additionally, there is a $30 credit to sell the disk. I don't believe anyone would keep it and furthermore, I don't believe anyone buys a game and copies it to their hard drive. What 99% of people do is rent a game, copy it and then return it. This all goes back to the question of how many people who play games and have a modded Xbox pirate them. 99% is my guess.