[stevenwoo]

There's a lot of inertia for some people to stay in one place, much less to change countries.

Judging by Facebook, about ninety percent of my high school class in a small town in Texas stayed within a half hour's drive after 30 years.

One of my coworkers in the 90's moved from Canada to Austin and eventually moved back to Canada. It was just cheaper to live in Canada with a family for him at that time, even with the pay disparity - and he was super talented in a niche field, I think the other major option for him at that time was California.