This is probably a good move for Tesla. The reason Superchargers exist is to enable road trips, which are a tiny fraction of most people's driving. For anyone with enough money to afford a Tesla, if you need to use Superchargers often, you're better off with a PHEV or a conventional car, because even with Supercharging, you just waste so much time charging relative to gassing up. Even so, there is a certain profile of person that buys a very expensive car and then can't resist the allure of free electricity or the cool Supercharging tech. With so many new Model 3s, these people will clog up the Supercharging lanes, and make roadtrips in a Tesla even more painful. Simply increase the price ten bucks or so, and the cheapskates and tech enthusiasts will disappear and leave the Superchargers to the roadtrippers that have no other option.