The NYC metro area is 23 million [1] which is about 7% of the country (23/300). There's a good chance somebody who works in NYC grew up nearby.
That said, if you chase fortune and fame for a decade and then retire to Minnesota you still come out ahead... Even if rent is twice as expensive in SF, if your salary is twice that then your savings are also twice as much which will go a longer way anywhere but SF.
[1]: https://en.wikipedia.org/wiki/New_York_metropolitan_area