Not that we didn't know, but here you've got statistical proof.
The 5 U.S. Cities Where People Earn The Biggest Paychecks:
No. 1 Best-Paying City: San Jose-Sunnyvale-Santa Clara, Calif.
Overall median pay: $93,100
Starting median pay: $68,600
Mid-career median pay: $128,000
No. 2 Best-Paying City: San Francisco-Oakland-Fremont, Calif.
Overall median pay: $73,500
Starting median pay: $57,200
Mid-career median pay: $108,000
Feel free to discuss (1.) why are salaries so high, (2.) why are starting-up costs so (relatively) high, (3.) why are operational and go-to-market costs significant?
I'll start out with an often forgotten business dogma: you have to spend money, to make money.