>Profoundly dumb people have been heads of state, CEOs etc. So why not the richest person in the world?
It's simple to explain away - other people have appointed heads of state. And I have not heard of an idiot (in medical sense) top20 Forbes list CEO who's also been there since day 1 (i.e. the founder, not some figurehead appointed by a board for an arbitrary reason).
Can you appoint yourself the strongest person in the world or the fastest 100m runner in the world?
[0]While someone like the Saudi king or Putin can in theory allocate their respective states' funds to themselves and thus become the richest, that would simply be converting power into money, and not a result of some kind of entrepreneurial ability.
>If 5 billion people flip coins all day long one of them will eventually flip only heads all day.
This argument is flawed since that would assume a person would win some money every time they flipped correctly, when in reality nobody is going to pay anyone for succeeding in a flip. And applying that directly to business also breaks down because it is self-evident that the ways to lose money greatly outnumber the ways to gain money.