I had the opportunity to work/move to San Fran a little over 10 years ago. Would have been move than you stated plus free housing, I didn't go. Mostly because I didn't want to raise my kids there. Like everyone has stated everything cost a lot more there, food, fuel, insurance, housing, everything. Plus there are a lot of people there, very crowded.

There is however a lot of cool stuff there too. Hell having In-N-Out is almost worth it.