There's plenty of tech stuff and tech people in NYC. That little kickstarter site isn't in san mateo after all. Your new best friend digital ocean isn't making white house rooms across from twitter. etsy is allowed to be as dumb as it wants.
In NYC you have non-scary transit running 24 hours that'll take you home because everybody is within walking distance of a metro station (and not just to a parking lot where you pick up your car then drive another 30 minutes home while tired at 2am).
Population. SF: 800k (bay area entire: 7 million, but over 40+ miles) NYC: 8 million. In NYC you have lots more people within transit range making people-involved things like meetings, dating, and varied social contexts immensely easier (and more interesting, exciting, unexpected, varied, ...).
NYC has its street people population under control so it's less scary walking around fighting off beggars are street pooers.
NYC's parks are kinda great.
and best of all, no Karl.