Remember GT5 will have tons of car to download, so, they could just release it with 300~500 cars and put all others to download. It won't be good to pay for anothers cars, but if they're cheap it's okay. I would be really angry if they made possible to buy cars that are already in the disk with real money. Imagine, it would be just paying 10 $ and get a Citroen GT as first car.