I'm not even suggesting a 90% tax rate.
But we know that money can decrease unhappiness, up to the point where you don't have to worry about food or water or shelter; (and maybe health care) we furher know that extra money on top of that doesn't increase happiness anywhere near as much.
We have actual evidence of this.
Further, we know that money earned beyond your needs is less likely to be spent, which means it doesn't go back into the system - and can become tied up - effectively meaning it doesn't do it's one job - ie facilitating trade.
There is no question that giving $1,000 to the 10 million poorest americans would result in that money going straight into services and jobs ( ie other people's pockets) whereas giving $1,000 million to the 10 richest americans wouldn't really make them do much - they're more worried about investments and keeping the wealth/power that they have.
This kind of wealth redsitribution choice is one which any society can and should make.
Some people probably get more worried about money the more they have - they fear losing it, and get distracted from actually living a good life.
However i don't know what the best mechanism for addressing this is. Taxation and capital controls are tools, but may not get the desired results.
There are cultures where tipping is considered rude, where doing a good job is it's own reward. And to expect a monetrary reward for being a good waiter or whatever is seen as misguided. You are proud that you are good at your job, because you feel satisfied by knowing you are good. Not because of some external reward system.
We need to break the school system which doesn't teach children to be proud of their hard work and recognise when they are talented and instead focuses on results and external rewards. I actually work with kids helping them do their homework, and all they seem to care about is getting the answers as fast as possible - not learning how to solve the puzzle... It is rather sad, though i do my best to be a positive influence.