Are you saying you'd snub what is going to be a truly awesome game simply because it doesn't have a certain visual feature? Not to mention no other GT game has actually had a cockpit view, and you'll reconsider getting GT5 because a new feature that PD has introduced won't be applicable to every car?
Isn't that being a bit rash?
Anyway, the way I interpret the 200 interiors as are fully detailed cockpit view. Every car will have some form of cockpit view; for the "standard" cars they'll be basic (eg no stitching on seats, non-essential gauges in dash inoperative etc) and recycled for similar models (read: the million Skylines sharing a common cockpit) with generic brake rotors etc in terms of the exterior, whereas for the premium cars they'll be fully and authentically detailed both inside and out.