I regret my initial phrasing about Dunning-Kruger, which was incorrect as you have pointed out (and as I conceded below some 3 hours before you wrote your rebuttal).

Also, my point is that if I'm making $100-$200,000 and am happy with my situation, particularly when I live in a lower cost area than the Bay Area, then I am much less likely to put myself through the pain of one of these interview processes. Unlike lots of workers, software devs actually have a choice.