[kurofune]

I would like to stress that "high achiever != intelligent".

And the choice to "walk away from this as best as you can and go about your life on your own terms" is mainly a money issue and not one defined or solved by intelligence.

[fao_]

Yep. A significant fraction of MENSA are in fact "underachievers" -- due to mental illness or poverty or something else.

source: several relatives are members

[OkayPhysicist]

I'd imagine there's also a strong selection bias there. It's not like being intelligent automatically makes you a member of MENSA. You also have to want to be a member of a society that uses IQ tests as a selection criteria. I'd imagine that self-selects for people who are intelligent but insecure about other facets of their life.