The thing I love about New York is the inherent challenge. You're among some of the most competitive people in the world who love nothing more than to squash your idea. And if you manage to convince those people or rise from their negativity, you know you're onto something.
I view it in many ways as its own little market economy with (close to) perfect competition among commodities. If something facing fierce competition (like restaurants, for example) can hold its own, you know there's some quality behind it.