> if they're healthy and successful why would they leave?
Because they could be even more healthy and even more successful, or simply just happier, elsewhere. People who can leave will always leave more often than people who can't.
> the families with college kids of send their chilluns to school, but plenty return.
And plenty don't. Again, those that never leave stay at a higher rate.
> and with high COL exploding in many cities, all the more reason to come home, esp. if their people are already successful in such areas
The more wealth you have, the less you are deterred by high COL. And COL only goes up in cities because people are willing to pay a premium to live there, often for the economic opportunities.
Because they could be even more healthy and even more successful, or simply just happier, elsewhere. People who can leave will always leave more often than people who can't.
> the families with college kids of send their chilluns to school, but plenty return.
And plenty don't. Again, those that never leave stay at a higher rate.
> and with high COL exploding in many cities, all the more reason to come home, esp. if their people are already successful in such areas
The more wealth you have, the less you are deterred by high COL. And COL only goes up in cities because people are willing to pay a premium to live there, often for the economic opportunities.