One of my closest friends worked as a captain for mega yachts.
They are owned by business men(and women). They’re run just like any other business these people own. Owners do keep a close eye on profit/ loss and he was generating spread sheets all the time. He most commonly reported to administrative officers inside the parent organization but on occasion directly to the owner.
There’s a whole network of vendors throughout the world for food and drink, linens, mechanical services etc. that deal only with super yachts. Orders placed while in transit and delivered once dockside. The level of organization is awe inspiring with the captain serving as ceo, cfo and captain. These vessels commonly do a circuit year after year with a few of the expedition type vessels being outliers. They run like well oiled machines. It’s been great fun knowing him and his bride (chief chef) and being on those vessels when the owners party isn’t aboard. If you’re white, young, South African and have no tattoos or obvious piercings maybe he can find you a job. If you want to sail hire on a small one. For the big ones it’s cheaper to power than sail so the sails are rarely used except for regattas and races.