Let me introduce y’all to the wonderful phenomenon of carrying capacity and K curves
The theory states there’s only so much a certain population can grow to in number within a certain environment.
1. There is no other city like NYC, that has an immense carrying capacity for all social classes.
2. If people, particularly from NYC, try to set up shop elsewhere for the lives that they’re use to, they’re in for many rude awakenings
3. A combination of 1 and 2, not saying there’s thaaat many Millionaires, but there’s simply not enough places for them to go, want to go, or be welcomed to be.
It may lead to some interesting literal and figurative developments, but it would be a larger undertaking to restructure somewhere outside of NYC to carry an NYC feel than to stay and pay taxes.