You only have to watch a boat costing a host or crew $1,000's per day sitting at the dock waiting for a couple of crew who tried to save s few bucks by using the ferry stuck on St. Thomas or waiting for delayed luggage. Sure the ferry works for many. If you have a day and dollars to burn with extra travel days on the day before and day after a charter great. If you are certain you are on the first direct flight of the day to STT even better. Late flights, delayed flights, missed connections to STT? Lost luggage? Early departure on the way home? Weekends anytime... all two much risk, worry, and hassle for us and those with us who do not want the disruption anyone in crew can bring to the entire guests list when a few decide to do the STT, taxi, ferry, taxi dance.