- There's the gamble that your LCOL small-town house is going to be worth anything comparable to what you bought it for if housing prices collapse enough to make HCOL houses a bad investment. Like, think of rust belt cities, and then think of the small towns on the outskirts of those rust belt cities.
Two issues:
One, HCOL locations are less affordable in terms of people's earnings than LCOL locations. That's why during the 2007-2012 real estate deflation, HCOL areas were hit hardest, and LCOL areas were not hit at all.
Second, who is taking the bigger risk in the event of a real estate collapse? The person who has 50% of their net worth tied up in their home or the person who has 20%? I'd argue that even in those towns that absolutely died, like one-factory rust belt towns or various West Virginia coal mining towns, the people who had investment portfolios were able to leave (or stay) with plenty of their wealth intact.
Seems to me like there's an arbitrage opportunity even on the level of reducing one's exposure to real estate risk.
- Calling people back into the office from remote work doesn't carry the same corporate obligations of paying their moving expenses that assigning them to a new city/region does.
- Isolation from your larger industry, especially when you are just starting out and trying to establish your career. If you have "fuck off" levels of qualifications, experience, and resources; then sure, people will put up with the inconvenience to them of you living out in the hinterlands.
Contrary to popular opinion, there are massive industries in small cities, towns, and even rural areas. Each such place has its own entire set of services industries too. Unemployment is often lower in small metros than in the biggest cities. Simply being in such a place means you are more likely to get a job in these industries rather than having to compete with 1,000 other applicants who are just resume-bombing the job ads.
Industries will continue to pop up in LCOL areas because these places offer an opportunity to undercut the competition in HCOL areas and deliver the same products or services at a lower expense.
- If your partner does not already work remotely, you've given them either a commute or a pay cut.
- Social opportunities can be severely restricted if you fall somewhere outside of whatever the town's mainstream culture is.
True, but also true if you are moving from LCOL to HCOL, or even between various regions. Any move comes with these drawbacks, but I wouldn't say a move from, for example, NYC to Des Moines would be an inconvenience in excess of its benefits. Does it matter that the commutes are shorter and the people are nicer?
- How many people actually move to a small town that they have no prior or current connection to? You can move to NYC or LA with no friends or family already living there, and possibly not even a job lined up, and most people will totally understand. If you move to any one of the many communities named "Farmington" with none of those things however...well, you should be prepared for a whole lot of "why are you here?".
- Moving to a small town can feel like failure to some people. Or like going back to what they worked hard to escape.
To many people, these social expectations (which only some people feel) pale in comparison to the benefit of escaping hours-long traffic jams, high costs for everything, and no hope of ever owning a home, or they pale in comparison to the benefits of enjoying a standard of living only enjoyed by multimillionaires in HCOL areas. When you can own a big house, can afford to have a family, can get home from work before dark every day, and have a high savings rate, why would anyone feel like a failure? This seems to me like an unfortunate case of HCOL culture convincing people to think less is more.
I don't have an answer to your question of how many people actually do it, but I do know that people migrate both ways. Otherwise, the hinterlands would have long since been emptied of people. Probably most people move one step at a time. For example, moving from a metro with 10M people to a metro with 1M, or from 1M to 100k, and so on.
The definition of success has changed over time. Maybe the next generation will look at our worship of trendy locations with a skeptical eye, and seek to avoid congestion costs.