Somebody who founds a company worth $5 billion is royalty in Silicon Valley. Around Wall Street you'll find fresh-faced kids with nothing more than degrees from Andover and Yale running hedge funds bigger than that. Much more money for much less work, risk and accomplishment.
You just can't make enough money from startups to impress people in NYC.
Other than that I'll say that NYC has the most formal dress code of anywhere I've been. You can show up in "hacker costume" that includes clean denim and a t-shirt that fits in any town other than NYC. In NYC, people ~will~ hold it against you if you don't wear a button down, tie and all that.
My motto is "when in rome", but it's not an attitude that's welcoming of tech talent.