> I would go as far to say that no self-made billionaire is stupid.

Making money is far more about luck than skill. Always has been. Net worth is not a proxy for ability.

[edit] Don't get me wrong I'm not saying billionaires are idiots. I'm just saying that having a fat stack is not in and of itself a proxy for aptitude. Judge that on the person instead. Just judging them on their bank balance is an unnecessary appeal to authority that hasn't historically held.