You can have a lot of midgets on a yacht, but where would you keep the donkey?
That's what distinguishes super yachts from mere regular-sized yachts. The wide base of the hull increases stability on the water to the point that donkey husbandry becomes practical.
Or maybe it is just a legal way to escape taxes. Enough to be worth owning the yatch and paying for its crew and maintenance. Just that should give a hint to the low bar of the money amount involved.