I wouldn't necessarily consider 75k/low 6 figs to be rich automatically (though the latter has the potential to become rich over time) but I think it'd be better to reframe it as presence of the domesticated/white-collar middle class. The type of people who had a cushy upbringing and went the traditional route (going through uni and then getting a desk job at a large corpo) in life without questioning the world around them.

I don't mean to be overly harsh in my description- I come from a similar background myself