It's a high score for some of them. It's not that they want any tangible benefit, they just want the most so they can say they're the richest person.

They must be sociopathic in order to do this. They just don't understand other people suffering in the same way the majority of us do (more of an abstract concept).

The hyperrich who don't fall into these categories don't stay wealthy for long. If someone lucks into this situation somehow, they'll either get swindled, start using their wealth for causes they care about, or stop growing their wealth because they have enough. There are quite a few examples of benevolent millionaires: once you get to the billions, there's none. Attrition removes all benevolence on the climb.