Social Exchange Theory of Evolution of Human Intelligence. Brains are the most expensive organ, stops paying off after a certain amount with regards for daily survival for the past 2000 years. Hence the only reason why large brains even exists is so man can subvert his fellow man, so that, like a kike, he can climb to the top and abuse power to all hell and back.

Only possible exception to this rule is to pass Ancient Chinese royal examinations, which, as far as I know, is the only IQ-scaling non-subversive (not banker, not merchant) occupation theoretically available to the entire population.

High IQ people understand that which is why they don't talk very much about their IQ number.