Aside from the fact that many of us who don't answer pollsters or want our personal details splattered across some cloud server, aren't signing up (or signing our kids up) for IQ tests.
Secondarily, I'd rather have a hard working normal person than a slacking smartest-guy-in-the-room hanging around. At least the normal guy will bust into a sweat trying to fix the problem, and often success is mostly perspiration.
Americans are dreamers, and have been raised in an anti-class structure. I'd go so far as to say, we celebrate REAL diversity: Anyone can be President, anyone can be a CEO, anyone can open their own business. We can outmaneuver anyone from Europe, Asia, Africa, and South America (the Antarticans, however...), and people who like Springsteen twice on Sunday.
A recent study indicated that the higher your IQ the more deceptive you are. Explains some of the idiot Professors.