People love to drive them and if they drive them in a game, then they will enjoy it without buying and that's why copyright applies to REAL cars. IT'S FOR MONEY!!!
Not quite, it is about the money though. If someone makes a game where the car is unrealistically rubbish it damages the car's brand, copyright exists to protect assets.
Believe me, enjoying driving a car in a game has no comparison to the real thing, I always loved S2000's in games, eventually bought one and didn't play a racing game for about 4 years afterwards as all the tactile excitement of the real thing was missing. For things you can actually do, real life wins out every time!
nice model by the way, looks nicely low poly, stick a good texture on it and it'll be sweet