You can excel at certain things and still be an idiot in many other respects. I wouldn't measure intelligence by the amount of money one makes. I can't believe I even have to explain this.
I agree people can say idiotic things but I’d also suggest that there is a correlation between high earners and intellect (not to be confused with ego or eccentricities).
I think to label Kanye as an idiot is an example of reductivism.