Companies tend not to publish their costs, but we can find some info about the economics of charging stations. A grant program in Texas subsidized up to 70% of the cost of charging stations. Tesla bid $500k for a fast charging station with 17 plugs, and around $380k for a station with 9 plugs.[1] That's $29k per plug for the 17 charger station. Assuming they asked for the maximum subsidy, that means Tesla's costs are around $41k per plug.

If Tesla bills customers 20 cents per kWh above market electricity rates, they'll make back the cost of the plug after 205,000kWh. A typical EV has a 70-100kWh battery, so that's 2,000-3,000 full charges. If it takes an hour to fully charge a car, then each plug will be profitable after 2-4 months assuming a 100% duty cycle. Actual duty cycles are much lower. If we assume the charger is active 15% of the time, then it will be profitable after 18-30 months. Again, these are all rather pessimistic estimates. Actual markups and duty cycles are higher, and actual charging times are shorter. If we assume a 20% duty cycle, 45 minute charging time, and a 30 cent per kWh markup, it only takes 8-10 months to become profitable. I didn't include maintenance costs, but those are much lower than gas stations because charging stations require no full time staff.

1. https://www.forbes.com/sites/bradtempleton/2022/04/14/teslas...