It's simply the opposite of those who don't quit ( health issues apart).
Those who don't quit are making a living (to varying degrees) at what they do . Those who are good at what they do are generally in demand and make a good living. Those of mature age group who are good at what they do,have become good with a combination of hard work, networking, and an ability to usefully use their dead time when travelling the country. Very important.
All this travelling for an hour and half show.
I admire those who make a living and stay happy whilst tramping up and down the country or should I say countries. Ergo ,if you can't make a living and are not happy (not withstanding being a lottery winner) you might quit,in the same way as aspiring professional sportspersons , aspiring acting professionials et al may find the life style too difficult ,and probably drop down a level to being a semi professional / or an enthusiastic amateur - or G.forbid - quit altogether.