Sunk cost? Selection bias? I don't think you can get a PhD by accident, you have to really want to work in academia (or a specific industry). And I doubt getting a second post doc position is all that hard (as long as you're willing to travel), given they're capable of getting the first one. My understanding is that universities quite like being able to hire cheap, hard working, disposable researchers.
People who go into academia are probably willing to live the life of an underpaid researcher. The fact that they have the post-doc title instead of the professor title probably is that big a deal, nor is the salary going to change their decision. The lack of autonomy is probably annoying, as is the lack of stability. Having to worry that they might change labs and maybe cities every 3 years, and not knowing for sure if they'll get a job is probably the only thing actually making them quit.
Sunk cost? Selection bias? I don't think you can get a PhD by accident, you have to really want to work in academia (or a specific industry). And I doubt getting a second post doc position is all that hard (as long as you're willing to travel), given they're capable of getting the first one. My understanding is that universities quite like being able to hire cheap, hard working, disposable researchers.
People who go into academia are probably willing to live the life of an underpaid researcher. The fact that they have the post-doc title instead of the professor title probably is that big a deal, nor is the salary going to change their decision. The lack of autonomy is probably annoying, as is the lack of stability. Having to worry that they might change labs and maybe cities every 3 years, and not knowing for sure if they'll get a job is probably the only thing actually making them quit.