I know what you mean. It's the same with one of the local train stations. Cars left there almost definitely by commuters for the day as far as I can tell. It makes things a bit ridiculous when you are dealing with a small handful of bays!
It's pointless putting anything else other than a 3 pin plug/2.4kw charger at those kind of places because you know the car is going to be there for 8-10 hours so you might as well just chuck in a charger that is cheaper and slower. You can then fit more of them.