At a certain point there’s nothing left to spend it on, and they use the money to make more money.

In my opinion all billionaires are sociopaths. I think it’s necessary to be one in order to become one, and most definitely to stay one. If you think “yeah I am the best person to manage this wealth”, then you’re already putting yourself over society. That they can look at the state of the world, and double down on personal wealth, makes it even clearer.