Has your marina management actually told you that? Most marinas I'm familiar with just charge by the boat's length on deck. For instance a Catalina 22 would be charged for 22' even though it has an outboard hanging off the transom.
Not so in BC. The sailing co-op that we belong to was going to be charged for 32' on each of their Catalina 27's. They finally agreed to compromise at 28'.
Even though we now own a 29' Mirage, we went slightly longer on the slip, to allow for extra stuff. A hassle, but we have lots of company.
From talking to other boat owners, it seems pretty common in BC Marinas.
Port Moody, BC
It's not my fault they named a movie after our boat
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