Yeah, I think it's definitional.
This is not meant to be "America's most upper middle class neighborhoods", but rather "where America's super rich like to live".
You need to capture the average-distorting effects of the long tail of the distribution for the data to show what you want it to show.
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There is a cult of ignorance in the United States, and there always has been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that "my ignorance is just as good as your knowledge." - Isaac Asimov
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