Except that really don't need these chargers if you're charging overnight. The Model S can fully recharge 240+ miles in about 9 hours using just an electric clothes dryer outlet or a "J1772" plug. Those are dirt cheap to install (labor to pull the wires through new conduit to the parking space is usually as much or more than the box that goes on the wall).

Personally, I'd rather see hotels spend a few thousand bucks to install a bunch of NEMA 14-50's outlets or EVSEs with J1772 plugs. The cost of the electricity is pretty minimal, and it's certainly no worse than the upkeep on amenities like the gym or swimming pool (which nobody ever seems to use). If it really became an issue, the hotel could always charge a $5 fee for parking in the charging spot overnight.