What does it matter? You get hundreds of premium cars anyway. And the racing will be top notch as always with amazing physics, varied gameplay mode and realistic wheel support.
I know I'd rather have 700 extra cars regardless of whether or not they are premiums.
Also remember that they are turning a lot of the old standard cars into premiums and greatly enhancing the standard cars they have remaining with better visuals and the same features of the premium cars.
It takes the months to make each car, cut them some slack for making an amazing driving experience.