In the states at least on the Chesapeake Bay and tributaries the Clean Vessel Act helps subsidize the majority of the cost of constructing the pump outs so less of the cost is passed through to boaters. We had one installed at our Yacht Club and there is no cost for use and the condition of the grant is that all boaters (not just our Yacht Club) can use. It is also easier to dispose of the waste.

I would imagine the BVIs wouldn't have a grant program to help subsidize and disposal would be harder...so it would be more cost passed through to the boaters maybe?