Doctor Venkman;142648
Yes, Sony gets money from the sales of the game, but I assure you they don't get as much from a copy of the game selling on 360 as they do from a copy of the game selling on a PS3. Microsoft surely gets paid something from the sales on the xBox as well. So Sony wants to profit from the people who own both systems who will now buy the PS3 version to have it earlier, as well as the people who have the money to buy a PS3 and then buy the version of the game. Plus, this might boost sales from people who have old PS2's lying around that they never use, who will now break them out in order to buy the PS2 version of the game.
And like I said, almost no one is going to buy a PS3 for that particular game, its not a console pusher no matter how epic the franchise is. Sorry, but its not going to happen.