It would be interesting to know what portion of people disagree with your suggested cap, and why.
I would at the very least index it to inflation.
In the US one can retire comfortably on $3 million without relying on Social Security. From the downvotes, it's crazy to me that people think a limit of 300 "ordinary people's" retirements is unreasonable.
I really don't think people understand how little difference there is between having $1 billion and $10 billion or even $100 billion. It makes no difference whatsoever to have that much money; they can't enjoy it.
It is interesting, I wonder is it possible to get so rich and be kind, probably examples. I'm the kind poor person myself even what money I have I have given too much of it away. In which case I'm a dumbass for doing so but yeah.