Most states have laws regulating car dealers that make it difficult and expensive to open a new dealership. You also must be a dealer to sell new cars. A manufacturer, by law, must sell through a dealer and cannot sell directly to the consumer. The status quo is reinforced by dealers associations in each state (and nationally) that spend lots of money on lobbying to keep the current system intact. Tesla wants to sell direct and bypass the dealers. The dealers are fighting this tooth and nail.