I think that, somewhere north of $1 ~ $5 million is life-changing on its own. There’s no need for someone to have tens of millions or hundreds of millions. Tens of millions is like, changing multiple lives in a family with how much that can stretch.
Whenever someone has billions to their name, it is boggling to think about. That it becomes just ‘fuck you’ money at that point because more often than not, not a lot of billionaires out there being charitable. When they know they’re set for a few lifetimes just by a single billion alone.
No single person should ever have that amount of gross wealth.
A simple estimation based on investing that amount of money into a total world stock market index fund (e.g. VTWAX) would be your yearly expenses divided by 3.25% (pretty conservative rate). The idea is that you withdraw 3.25% of your wealth from the stock market every year, and you’ll be able to withdraw that much purchasing power every year forever due to compound interest pushing the number up as you withdraw. Realistically if you’re not withdrawing the full amount blindly during market downturns you can kick that number up to 4% or even more, but 3.25-3.5% is basically impossible to go broke with, and most likely will quickly increase your nest egg to double/triple/etc in most universes.
So, if my expenses were 50k/year in post-tax money, I would need to invest ~1.5 million in order to withdraw 50k of “free” money per year forever, inflation-adjusted. You can do the rest of the math on how many post-tax expenses a normal person/family has and will quickly reach the conclusion that hey, a billion dollars is kinda fucking crazy.
This right here is why everything is so fucked up.