Cottonwood
Roadster#433, Model S#S37
29.76c / kWh
That's quite the premium.
Not really a premium at all. Let's say that they paid $3,000 for equipment and install, and that the gross profit per hour is $3/hr. That means its 1,000 hours of charging just to pay for the install without any cost of money. If they get 5 hours of charging a week, then that is 4 years until they break even. On top of that, they probably dedicated a parking place to charging. Parking spots are not cheap either.
To be able to charge at twice the rate of a 14-50 in a nice location, $5/hr is cheap and as I pointed out, its still half the price that an ICE would have cost you for gasoline.