Superyachts considered

Am I alone in this?   When I see pictures of Russian owned "superyachts" that look like this:

 or this:

my thoughts run to "why does anyone want to own something that looks a mini cruise ship anyway?"

I mean, they must cost a mint to operate (although maybe that can be charged to a company?), but seriously, who has that many family and friends that they can entertain on it and make it seem inhabited?    I imagine most of the time they are far from fully occupied, and feel kind of empty and wasted.

And if you let people you don't know well take a holiday on them, as some sort of reward for hard work, or for sleezy deal making, don't you get problems with bad behaviour?