Really? I have researched this a little. In the Caribbean, it seems you can get much better accommodations for about twice the price of a liveaboard, but greatly inferior diving support. The handful of boats that offered diving were just rendezvousing with dive boats or land-based operators to pick up tanks and sometimes divemasters--more of a taxi service than a liveaboard. I have not seen any private yachts for hire at dive destinations here in the Indopacific, although I'm sure they exist. I would be interested if anybody has a link.