PS3 is very flexible in that regard as it's tied to the console, not the user. you can buy one game and share it with a friend and play online together. The downside is you can't visit a friend and show a game you own on their PS3 by downloading and playing then and there, which you could on XB360. The abuse of game sharing has also seemingly caused Sony to drop the hardware limit to two consoles - you and one family member or friend. Ideally we'd want a best of all worlds, such as two hardware devices and unlimited machines via account, so you can play with family members on second console, or visit friends and play.