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.
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. Dependent on where and when obviously.
Good luck. Most charter companies are financially viable because they manage and maintain other peoples boats. Limits the investment.