I still disagree on the IQ requirement for money, but looks like you're right about this. I was mistakenly searching for "average IQ by profession", rather than "average iq for engineers". Thank you for the link!
Right, I wouldn't call it a "requirement" per se, but not having such a high IQ is like being only 6 feet tall in the NBA. It takes some serious cognitive abilities to be able to amass 8 figures without any prior family fortune of any sort.