Speaking for myself I know what NYC is like and it's a basically a shithole filled with narcissists, psychopaths and useless welfare recipients. There are also some rich artist media types, but it's not like developers get invited to their parties.

What is there for developers? Almost nothing, plus high costs.

The Bay area has way better restaurants, culture, diversity and intellectuals plus nearby beaches, mountains, wineries, skiing, it goes on and on.