If you are or have ever been in the market for room shares in SF, you'll know there are TONS of professional workers making a decent wage coasting on rent controlled leases that have somehow been passed along for years paying way less than they should be.
I also know tons of professionals making 6 figures+ paying way below market. NOT exactly poor people.
How do you think it is for the young kid hired in to work somewhere that has to look for a place in SF while his boss's boss who probably makes 10s of thousands more pays $1300 a month?
But wait, that never happens...rent control is for poor people. Yeah right.