I think it has to do with the Brain’s favorite sources of dopamine. If you steer clear of the hedonistic approaches and focus on finding constructive ways to get your dopamine, those constructive ways may give you a living you enjoy. Physics, math, trading, coding, writing are all self-feedback fields you can iterate on in your own to get as good as you want to be. The fact that you don’t depend on others to make progress can give you infinite dopamine rewards and fuel more desire to work. The key is finding your Brain’s most constructive sources of dopamine and see how much you can feed it.