[JohnFen]

> I thought it was pretty much accepted that IQ is very important for success

I don't think so. I think it's orthogonal to "success" (I'm assuming that by "success" here, you mean wealth).

There are tons of people who are wealthy but not terribly bright, and there are tons of people who are bright but not wealthy. From my personal observation, it looks like the intelligence distribution is about the same in the set of "wealthy people" as in the set of "not wealthy people".