This might be practical, but it does not make for a proven profitable use of the "fact". Currently it is way easier to test children/students/workers for intelligence or academic achievement rather than subject them to a genetic test or pedigree inspection.

Pedigrees and genetic testing in animal breeding are way more useful. But there you have completely different structures and goals. And some of them, particularly diseases with high heritability like canine hip displasia, can't be solved by current genetics yet.