If you work out how many $$$ are involved, it's trivial compared to the price of the cars. As another datapoint, adding free lifetime charging to the now-discon

If you work out how many $$$ are involved, it's trivial compared to the price of the cars. As another datapoint, adding free lifetime charging to the now-discontinued low-end Model S cars was $2,000. I'd bet that the dominant economic thing is how annoying it is to rent land and construct lots of little facilities. Reducing supercharging from free-for-all to mainly long distance charging is a way to minimize the annoyance while keeping most of the benefit to car owners.