Exactly right. But the commerce clause issue is very relevant. This article in the Boston Globe is a must read:
The fight for direct car sales - Opinion - The Boston Globe
Quote: But the thinking of many is that, if the court battles go onward and upward, the US Supreme Court will likely rule the entire auto franchise system unconstitutional; under the Interstate Commerce Clause, it would be seen as a restraint on trade. If so, the winners would not only be Tesla but all of us. Imagine how great it would be to buy your next car on Amazon — and even better, never have to deal with a car salesman again.