While I agree with what you're saying about the more successful in life being more successful with women, don't automatically equate being in college with being intelligent or getting a GED with being unintelligent. Most of the college age guys I know are complete idiots, whereas I got my GED when I was 17 yet I have a 148 IQ (genuinely tested, not the internet IQ test).
There are different types of intelligence as well. There is factual/reasoning intelligence and social intelligence are the ones most related to this discussion. If you are very intelligent in the first one, you are a genius, if you are very low in the first, you are an idiot. High in the second one, and you are charismatic, low in the second one, you are a sociopath.
I think guys who are highly factual/reasoning intelligent generally have a harder time getting with the girls to begin with, but then an easier time keeping them, while those who are socially intelligent have an easier time getting them than they do keeping them.