Not sure what country you're from but in France it's not rare to see 0.30-0.60€ per kWh and even requiring a subscription on top of that.

What is actually the realistic cost. Covering infra, the charger and the maintenance of everything involved. Power and transfer included, with transfer including any standing charges. And after that you probably want decent margin to well run the business.

would be nice if california had such discounted prices... :)