Does anyone want to wager that IQ scores have no effect on income levels?
Likewise, I doubt you're going to find many nuclear physicists or heads of international corporations with IQs less than 125. But the myth that with simply hard work you can be anything you desire has been propagated by people who should know better. The truth is every human has capabilities limited by what's inside their cranium.
“Does anyone want to wager that IQ scores have no effect on income levels?”
It is well documented that IQ have a lot to do with income.
Read “The Bell Curve” by Charles Murray.
http://en.wikipedia.org/wiki/The_Bell_Curve