I know from talking with people that younger ones are leaving. In one store, two employees recently left, because of the high cost of living. One of them owned a home, one did not.
San Francisco, Boston, and New York have higher paying industries and law firms, mutual fund companies, etc. that pay much more than SD companies. That’s why their median income is higher there. I wouldn’t compare SD to them. Compare SD to Florida, Nevada, or Phoenix, in the mix of jobs and incomes.