> This, 1000x this.

Repeating a grammatical error 1000 times does not make it "more better".

If you look at actual statistics, they do seem to back up my impression: income in SF is not your typical bell curvish distribution you'd see in many other places. There are a lot of people making a lot of money, more at still quite a bit of money, and a small peak for those making very little money, and fewer in between:

http://www.city-data.com/income/income-San-Francisco-Califor...

Look at:

Distribution of median family income in 2009 (number of people)

Distribution of median household income in 2009 (number of people)