it's always about the rent
Disclaimer: I've never been to northern California
Actual question, how much is San Francisco skewed by how small and affluent it is? Chicago and New York (and KC for that matter) have significant areas of the city that are shitty which drags the median rent down significantly. It seems like San Francisco calls their analogous areas "Oakland".
Also, great thread to find another instance of wackattack telling someone to stop following him around