The problem right now is that the
BVI are basically closed to Americans. If you go there you have to isolate yourself in a
hotel room for two weeks before you can go anywhere or do anything. That includes getting onto a
boat and sailing off, even if you will be entirely alone on the
boat. This makes charters essentially impossible.
God willing, that will change soon, but God only knows when "soon" will be. Once things open up, and I hope that will be soon, charters will be more reasonable. Of course, if you are prescient enough to know exactly when things will open up, and schedule a
charter at exactly that time, then you will make out like a bandit. But if you miss it by even just a few days, you may lose out big-time.
Hence, I believe, the lack or responses to your question.