Well...you have the 2 "Moorings" charter outfits there...Moorings, and Sunsail and TMM and Barefoot yacht charters have been around quite a while and also operate out of St. Vincent. I have some friends that run a crewed catamaran that is competitive with their rates for bareboat and includes most provisioning. If that is of interest here's a link:
Lost Our Marbles - Luxury Catamaran Charter
Moorings ran between 20-30 bucks in the area a couple of years ago.