What type of business are your planning? You mention chartering and rental in your last post. By chartering, do you mean a captained charter or bareboat? Big difference in risk, reward, and liability.
I was going to offer both. Of course rental would only go to qualified sailers who have taken a barefoot charter class. My other plan was to offer a seacamp off Cumberland Island where I take the boat out and moor it appropriatly. Who ever is staying out there would just take the ferry and use a dingy to get to the boat. Since the one hotel on the island charges $450 a night this is a viable option.
As far as the $35 an hour for a captained charter that is competitive. Most of the charter companies will put a captain on the boat for $150-$250 a day.
Figuring in rough insurance estimates from others my pricing structure is half of companies across the state line in Florida.
Good luck. Most charter companies are financially viable because they manage and maintain other peoples boats. Limits the investment.
From my marketing analysis this market is untapped. Lang's Seafood currently has the only charter business in town and own's the marina and public docks. They have a ferry going out to Cumberland and recently secured a concession for it. They are now the only charter allowed at or around the Island. This is something worth challenging, and I believe a market exists for sailboat charters. They have over 64,000 passengers a year on the ferry going out to Cumberland.