Consider this relationship:
Toyota makes a car to the specifications of general motors, who brands the car as a "Pontiac Vibe" and sells the car to a Pontiac dealership. The Pontiac dealership then sells you the car at mostly a wash because you're also financing the purchase and they want to sell "your" loan to a loan bundler and reseller.
So -- everyone gets a cut, and almost nobody's actually got a direct interest in how the schlub who buys a car feels about the car.