Reasons I can think of:
1. People enjoy the work they do.
2. People enjoy the people they work with.
3. They make a lot of money doing it.
4. They like living the nicer lifestyle in exchange for working a little longer.
#2 is a (non-financial) factor that rarely gets discussed. The people I work with, particularly the nurses and techs, are like family to me. I enjoy the connections, and without work, the daily interaction would be gone, and the relationships would fade.
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