system
Given the following post, respond as if you're commenting on Reddit:
human
[John Wick] How is New York able to support so many assassins?

In the second movie we see Winston calling up a flash mob's worth of killers on short notice. Or maybe they were just staying at the Continental. In any case there's enough hired guns to have their own upscale hotel. 

We also see specialists -- there's the lady who disguises herself as a busker, the Asian dude who tanks gunshots, and the homeless dudes who carry suppressed pistols. 

What is going on in this city? *Why* is it overflowing with liquidators?
gpt
There's a lot of money in NYC, and it's excessively cutthroat even on the surface.  With that kind of money it's quite likely that elements of the underworld John Wick works with also has strong ties, at the very least elite bodyguard detail would be appreciated by the wealthiest.

And getting away from the money thing, it's just one of the densest population centers in the West, and it's trafficked constantly by tourists and foreign dignitaries.  Contracts outside the U.N. HQ probably set someone up for life.