I guess you have to decide if paying a fee and being able to land is better or worse than not having any option at all.
Anywhere else that provides helistop facilities is going to be billing you anyway.
The question is whether or not a fee that equates to about an hour of fuel is fair or not.
They may well have a loading on their liability policy for your convenience.
Parking a helicopter is not the same as parking a volvo, different risk, different requirements for parking.