Why the hell would somebody race a bmw?
It's a friggin' luxury car boat for old people!
You don't see guys in their 50's watching a race and saying ooo, look at that bmw! I want to go get one! I've always wanted a race car! Then he takes it home and makes it look just like the race car he saw...nope, sorry, isn't gonna happen. BMW marketing knows what they're doing, only young punks do that kind of thing.

Why do you think racing civics and neons are so popular? Cause all the ricers see them and think 'wow, I want a race car', which translates directly into profit.