Another point is that I think Tesla should make optimal use of charging for its own marketing benefit. Obviously SC and DC programs are creating substantial marketing value for Tesla. But I think they can go further. In DC locations, they also like to place J1776 chargers for nonTesla vehicles. This is very smart hospitality. The EV owners who use these are potential Tesla conquests. If we take this further, such free charging could be provided at SC locations as well. Say you have 6 SC stalls, add two more J1776 stalls. (This also would provide some overflow for Tesla owners is needed.) Now if controlling the amount of charging at the hospitality stalls is an issue for Tesla, then let's consider a charger that requires authentication for use. The guest could simply register through a smartphone app and get a certain amount of free charging from that and any other Tesla hospitality charger. This is an excellent marketing value for Tesla, not only do they get to create a positive experience with the guest, but they get contact information useful for prospecting. Through the app they can provide marketing material to the prospect and direct them to the website or nearest store. Moreover, they can find out things like what vehicles does the prospect own and for how long, has the prospect ever test driven a Tesla, when might the prospect like to buy their next car, and how might Tesla contact them. When Tesla is trying to sell hundreds of thousands of cars this kind of interactive marketing and lead generation will be an invaluable tool. Automakers spend thousands of dollars per conquest. We really do want Leaf owners hanging out at SC locations dreaming about the day they'll upgrade to Supercharging and Tesla. We want to know when they are in the market and make sure they get a test drive before they buy their next car. And we absolutely want them to rub shoulders with happy Tesla owners because these are our best sales people. All this can happen around positive charging experiences.
BTW, as a statistician, I have worked in direct marketing for many years before going into finance. The interactive marketing opportunities that Tesla has are immense. They are a direct marketer's dream. If Tesla does interactive marketing well, they may need to spend very little on advertising for a very long time.