That's the thing, once you reach a certain level of net worth it's actually relatively hard to become poor again. You have to actively make really poor financial decisions over a long period of time.
Buy a boat for $100,000 and it'll cost you money to maintain and run.
Buy a boat for $100 million and it'll earn you money if you lease it out or take passengers during the 11 months of the year that you're not using it.