Installing games question

I love the new ability to install games, but who else sees that it could go wrong? I mean lets use an example

Guy 1 "Hey can i borrow X game?"

Guy 2 "Sure"

Guy 1 installs the game to his xbox, then gives it back.

Guy 3 borrows the game from Guy 2 later that week and installs it too.

Guy 4 does the same.

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Couldn't this mess with buying and selling of games? I mean, buy one, install it on more than one xbox, and everyone goes happy, except the people that make the games. Wouldn't they lose money from this? I mean A LOT of money in the long run?

No, you have to have the Game Disc in the tray in order to play the game.dengel54