The costs of installation per cabinet is probably about $100k for the latest v3 chargers. Tesla doesn’t publish the cost but the cost for competing CCS DCFC stations is well north of $100k each.

Let’s say the cost of electricity Tesla pays is $0.11/kWh like your house (which it isn’t) and they are marking up $0.33 and charging $0.44. And let’s assume each car charges 80kWh every time it’s plugged in. It would need to average over 10 car charges a day *per cabinet* for a year to recoup that $100k. Depending on location, the sites may sit mostly empty most of the week so it would take over a year for Tesla to recoup the installation costs.

But as already said, electricity service for fast charge stations is a lot more than your home service. Plus ongoing maintenance and repair costs, site leases, internet fees, etc so they’re not simply just marking up electricity exorbitant amounts to rake in profits and rip you off.

Charging at home is always going to be the cheapest option. A Supercharger is meant for convenience, and as for anything you have to pay for more convenience.