Just because he has no interest in Cryptocurrency doesn't necessarily mean that he's stupid.
He is missing out badly just because of his bias against Bitcoin. I think that's pretty stupid.
The thing here is that wealthy entities such as Shiff SHOULD hedge the rest of their portfolio by allocating 1-2% of it to Bitcoin. It allows you to tap into Bitcoin's massive upwards potential, but only risk a fraction of your portfolio would it go to zero, which isn't going to happen.
Someone being wealthy and "not needing" Bitcoin to boost their wealth further makes no sense. It's a solid hedge to preserve their wealth, which is what people like Schiff use Gold for, but it hasn't done much at all to reflect the confidence in this metal.