Here's a thought. And just another thought to consider.
Think about buying your own boat...maybe even a boat just out of charter, that's perhaps five years old. You will pay about 1/3 of the cost new, and you will definitely be in the driver's seat at purchase time. There are a gazillion boats coming out of charter each year, with one owner more panicked than the next.
Pay cash. Keep the boat at a modest marina in the BVI. If you can sail her 12 weeks or more a year, you will definitely be ahead of a charter contract after five years.
And you don't have to worry about finding a stranger's toenail clippings in the salon.