I did all of the math 6 years ago and found it to be a loser anyway you look at it.
People at that marina (like others) are not spending money on their boats. Rentals are down, I'm sure service is way down. Service was never a big thing there like at Pennybridge, many users there did a lot of their own fixes.
The only value it MIGHT ever have is the property. In light of our current economic situation and the current politics in town I doubt there will be anything built on that land in my lifetime.
If you think a bank is just going to loan you the money with 10% think again. You need 50% or more real collateral, not just the property and marina, your personal assets, especially if the books can't prove out a profit. The bank are done owning properties and having to pay taxes and upkeep and then try to get rid of them. Before meltdown banks would figure the value of the land/business is equal to 10 years of profits after taxes. I bet the place doesn't clear $100,000 per year.
The boating business is on the down slide plain and simple.