If i can't level up with just the Online races and time trials, i don't know, i'll stick with those cars available at the start.. i really can't be bothered to go trough that 'career' and AI races..
Its not very clear at the moment, it seems in time trials you can choose "favorites" and "arcade cars" (and something else, I can't remember, but it wasn't "career garage" as far as I can remember), but its unclear if "favorites" are career cars or not.
Even if there are only 10 Premiums in the game, there still wouldn't be any game remotely close to it. Lightning engine is worth the price alone Who gives a sh*t about standard cars..