Just some random speculation, but how do we know the choices are random? Moreover, I think there's an element of competence being enjoyable. If I start to lear

Just some random speculation, but how do we know the choices are random? Moreover, I think there's an element of competence being enjoyable. If I start to learn a hobby and experience little successes along the path to competence, that will reinforce it as something that I want to do. Eventually you'll get good at it, or at least for very young children better at it than anything else you can do, and again, competence is enjoyable. There's also possibly an element of a sunken cost fallacy. You've spent x amount of time or resources on some thing, so you start to justify to yourself why it's worthwhile to pursue or to have done.