yah, it does. i dont sell cars, anyways, because u net a huge loss. when u sell a car u get barely any money, compared to what its worth (especially if u bought mods for it).
u kinda gotta stick it out, early on in the game. i dont know how far u are, but here is what i did.
1st car, mazda miata. raced with it until i could afford...
2nd car, mitsubishi lancer. slap a turbo on this baby, and run with it.
3rd car, chevy corvette z06. i totally worked the competition in amateur with this.
then save some dough for a zonda c12s to run with the big dogs.
instead of a chevy z06, some good choices are the nissan skyline, mazda rx-7, and many others.