Setting that aside, how does being the son of a guy who owned an emerald mine in South Africa explain him being richer than the descendants of Henry Ford or John D. Rockefeller? How do explain the children of all the other emerald mine owners?
> how does being the son of a guy who owned an emerald mine in South Africa explain him being richer
That's faulty, a posteriori reasoning.
There's no need for any such influence anyway, getting rich from PayPal is already pure luck and you should be satisfied complaining about that!
You can’t seriously claim that he was broke while being part of an emerald mining family? Also, why are you comparing him to other rich/er folk? Is your point that every extra million is an IQ point?
I hear a lot about the role of "family wealth", but I never actually hear about mechanism, how exactly it helps. If you're a legacy of a wealthy family, and thanks to that, get into Harvard, then sure, that's a real leg up, but it doesn't explain why some Harvard graduates become billionaires, while overwhelming majority do not. Similarly, if your family is rich enough to invest $1M in your startup, that's surely a huge advantage over regular people, but given how easy it is for non-scions to get $1M in investment funding (and it's really easy), I can scarcely believe that "family wealth" is really such a huge causal factor.
Unless he was completely estranged from his father for almost his entire adult life, which seems to be the case.