Solo Luxury Yacht ownership is almost dead. Even the very wealthy are either selling or downsizing because the cost of operating and upkeep is just too high.
Fractional is becoming the norm as costs rise and cannot be justified. Be careful, do not get into one of the 10 share programs. Two weeks here and two weeks there.
You are better off Chartering where you can select your location and dates.
Look for a four-share program where you get treated like a solo owner but only pay 25% of the costs.