Intelligence is an abstract measure, hard to measure and it's utility is unclear. Discipline, on the other hand, pays rich returns. Just in the last week there have been two articles on news.yc about how "experts" in every field are much more likely to be people who get average scores on various intelligence metrics like IQ but worked harder and longer on the same problems.
If you would like a more authoritative source that backs up this claim with extensive research take a look at the Cambridge Handbook of Expertise.
Isn't intelligence known more for ground breaking work than becoming an expert in a particular field?
Also, I think a big reason we don't see more results from intelligent people is due to our cult of intelligence that worships the raw power more than people making good use of it.
If you would like a more authoritative source that backs up this claim with extensive research take a look at the Cambridge Handbook of Expertise.