You can have offers "you can't refuse" even if you live in a major hub. But it's mostly the case that then it's a matter of you really wanting to do something on net as opposed to having to move to keep food on the table.
This varies a lot for different people at different stages of life.
For some, +$20,000 to their current salary is an offer they can't refuse, for others, they would need to double their existing six figure salary to even consider moving to another hub.
Anyone would move for a limited time period for a life changing amount of money like $20m/year.
But for realistic wages in my field, I doubt there is anywhere that would pay me enough to move. Short of moving into management (which I have little experience with) the most I could expect for making a move would be about an extra $40-60k/year moving to the Bay area which would basically cover the difference in cost of living and maybe a little extra pocket change.
Yeah. When a lot of classmates were taking jobs in Manhattan I pretty much decided you couldn't pay me enough after having an internship there one summer. (This was back in the 80s to boot.)
But, of course, I didn't literally mean that. Offer me a few million a year guaranteed and I could put up with a lot for life-changing money for a bit. But realistically not going to happen.
for $20M/year you are not really "moving". I are just getting another (very comfortable) place of residence, and you can travel as you see fit (incl. private jets).
Then you wouldn't even move. Just rent some apartment for a year and then return home when you're done. That's more than enough to pay for a mortgage and rent.
I could say the same. Money and a particularly nice location, that might be different.
Once the basics and some future security are there, more money just means a bigger resource footprint. That's still nice to have, people certainly continue preferring wealth over poverty, but it would be crazy if trade-off thresholds between modesty and ambition didn't shift a little due to awareness of environmental impact.