While what you are saying is historically true, the internet has made the car salesman role pretty much irrelevant. I expect the job (and dealerships themselves) won't exist a decade or two from now. There are enough pictures, videos, spec sheets, expert reviews and forum discussions available online that the word of a sleazy salesman is worth nothing. More and more customers today walk into dealerships only because they have to by law, but know exactly what they want and what price they are willing to pay.