Couple of thoughts to throw out: (1) retention, keeping somebody in the family who has or wants to move out of SV/NYC. (2) Getting that 35x rockstar on board who's not interested in SV/NYC. (3) Stretching the $$ (of company or staff), as most parts of the US if not the world are cheaper than these two areas. (4) Customer proximity, in that there are markets that aren't the (western) US, etc.
