I know someone who is an accountant for very wealthy people and quite a few seem to have useless children whose failing businesses they bankroll.
It doesn't matter if it costs a lot of money to maintain. Yachts and sports cars do the same. That's actually like the whole point of it, after all.
Don't confuse a hobby business with a failing business.
Plenty of people with independent means run loss making businesses for fun and/or support wives/children doing just that.
Have you ever wondered why kids climb trees?