Some people choose to be janitors, a physically tiring and low-paying job. This seems counter-intuitive, but it is not. Many people are okay with this because it’s mentally much easier to keep doing the same thing again instead of learning a more useful skill.
It’s the same reason as staying with C++ instead of exploring the magical world of Python: staying and moving no further is easier for now.
The bad part is that if no effort is applied the for now will be procrastinated into never disappearing.