>It's also bogus: not many can become rich, both for reasons for circumstance making from much harder to nigh impossible for billions, and also for purely logical reasons: wealth is relative, and if much bigger numbers of people were rich, it would get lost to inflation.

Yes, uninvested wealth is zero sum (cash and cash equivalents) and that is why we have inflation, but invested wealth can be positive sum.

If you use your uninvested wealth to invest into a poor country then you end up doing more good than bad.