Yep and I don't think that is a good measurement.

Of course, some of that is cost of living, but a lot of it is the lack of diversity in the ratings.

I'm sure Elko, Nevada has some doctors, but probably not many investment bankers. With less representation from other well-remunerated occupations, a doctor in Elko is likely to be in the top 1%; however, a similar doctor in Manhattan probably isn't.

That $383K is very likely a household income (or tax return AGI, which is a close proxy for household) figure, not an individual income figure.

Yes, it's household income, not individual.