This is based on a ridiculous premise:
1) That a highly paid professional in a city BRIMMING with recruiters and cool new companies throwing themselves at them isn't going to respond to market pressures and/or "the shiny new company" effect when you reach a certain growth point
2) That a "family man in St. Louis" will cost something comparable due to this odd concept unique to flyover country of having a family.... oh wait, people in the Bay Area have kids too.
I'm sorry, but there is a huge amount of delusion in San Fran about the advantages of physical proximity. I'm not idiotic enough to believe there aren't huge advantages, but it seems as if there is absolutely no point (that HN folks are willing to acknowledge) where the cost of being in San Fran and having to pay your talent at grossly inflated rates actually MORE THAN CANCELS OUT the benefits.