It may not be logical, but money effectively turns into a scoreboard at a certain point. The ultra-wealthy care whether they show up to the yacht club in a 100m or 150m yacht.

That individuals won’t optimize their wealth beyond $100m, $1b, or really any number just doesn’t square with observable behavior.

Starting a business self-selects for people that desire money (over other benefits).

The purpose of a business is money (otherwise you start a hobby or charity or something non-businessey).

Being very successful at business is a selection bias for people that are highly competitive at chasing money.

There's a bunch of traits in very wealthy self-made people due to the filter they have run through.

Tax too much, and we kill the golden geese of the economy. Examples abound around the world of crappy economies that can't afford good socialist stuff because they've demotivated the rain makers.