the "Freemium" model isn't really applicable here. You can't shave for a fraction of the shop price or razor blades at home; you can't make your own printer cartridges. But you can charge your car at home. In fact, you can even make your own electricity, using solar. So there is a natural lid to what EV drivers will pay.

In addition, charging stations will need a percentage of capacity utilization in order to cover their outlays. Lots of quick charging, high capacity utilization: makes financial sense. High prices, low utilization: you're in the red.

Therefore, I'd say the more appropriate model would be the Hotel Model, or the Discount Air Carrier model. Meaning: make money once you're at 65% capacity; price accordingly.