A very intelligent person can have trouble with math. That doesn't make them not intelligent, just not perfect. Not all college degrees require mathematical skills.
Anecdotal evidence is isn't. (evidence, that is).
Personally, I know quite a few people in the 1%, including many scientists, venture capitalists and CEOs. They're all quite intelligent and don't ever piss in their boots (nor would they have any difficulty doing so were it necessary; as well as subsequently pouring it out).
As I noted, it's a bell curve; you'll find rich folks on either end, although the lower end is generally inherited wealth, not self-made.
assets and buying power (which leverages assets) aren't as different as you think.
My point was that the term 'millionaire' doesn't have the same cachet today as it had when you were growing up, particularly given current real-estate valuations - although as you correctly noted, those assets aren't liquid, they can be leveraged.