The car will slow the rate of charge initially, and use some energy to heat the battery.
So it's a bit of a wash.
I do find it funny people complaining about these stations being out of service, but also being expensive.
Reality is it costs real $s to purchase, install, rent the space, likely upgrade power supply, pay for the electricity and maintain the unit.
If you assume a 5-yr life for your home charger.. and divided the purchase and install costs by the estimated kWh you will use in 5-yrs, how much more expensive does home charging look.