My "footprint" at my marina is minimal and wouldn't justify the extra fees that you're talking about. I feel that this is the difference between a resort marina and a working yard like the one WnW and I stay at. I don't think you can directly compare the two environments.-BubbleheadMD
WnW's marina ( having been there a number of times) is more of a resort mariana than my club. It is one of the finest facilities I have ever been to, anywhere and IMHO outdoes HHNorth&South, Spring Cove, and Mears Marinas. It is also a working yard which allows that and has many of the Annapolis Boat brokers offices on the premisis.
I do appreciate the footprint of where you are, but do not think that is the norm for most of the liveaboards. Since you do not incur addition costs for services there would be no need for them to charge you extra.