Economic Viability of Chartering a MegaYacht

Good Morning:

There are apparently a number of owners that commission a very large yacht to be built and then put it out for almost fulltime charter.

If one builds an 80m yacht for well over $110,000,000 and has an annual operating expense of three to five million USD, how can that owner make out financially?

The yacht will slowly depreciate in value and the money that was spent to build her almost certainly could be earning four to ten percent a year in some other financial venue.

Where is the profit and the motive to build and charter the yacht fulltime??

Can anyone explain this to me?

Thank you.

Pinellas Park, Florida