I’m cautious about using the word “need”. No one needs almost anything. That is not the standard we should be judging things. Anyone can point to anything you love and say you don’t need it. It can get miserable quickly.

Excessive wealth does corrupt, in many ways so a limit on personal wealth is easily justifiable.

Without writing an essay, a somewhat arbitrary 100 milion seems like a reasonable upper limit if there are some appropriate checks in place. For example, fines need to be proportionate to wealth. A speeding ticket serves a social purpose, but extreme wealth defeats the purpose. Proportionality, so it hurts the rich the same way it hurts the working man making a $200 speeding ticket becomes a $10,000 speeding ticket for the hundred-millionaire. Similarly taxes need to be progressive and at the limit, become 100%.

The key is to never allow personal wealth grow to where it can corrupt the state. Buying up media companies, funding political orgs, buying politicians etc, is a key goal of the wealth limit.