Plenty is doing.
"[In F.L.Schmidt & J.E.Hunter's analyses of 535 occupations in the USA] the correlations between verbal and mathematical reasoning abilities and occupational competence were highest for managerial and professional jobs, lowest for semi-skilled and unskilled ones; but, even in the latter case, they were still high enough to have practical impact. For skilled workers - white collar or blue-the correlations were highest for jobs like repairman in which problem- solving is an essential element; lowest for jobs like dental hygienist in which routine procedures are followed."
Disclaimer: this quote appears here only to spark discussion. It is not endorsed one way or the other. Make up your own mind. Or just refresh the page for another viewpoint. From a collection assembled by the late Chris Brand.