I think this question is quite difficult. In my opinion, it depends on the individual.
For people who see their hobby as just a form of entertainment, they shouldn't turn it into a career. Because, there is possibility that they will end up hating their hobby if they have to do it as work.
However, the people who love their hobby too much or want to be a professional, I think they should.
They like this will less likely to hate their hobby and can concentrate on their hobby as work thoroughly.
So Maybe The people who has a passionate on their hobby can earn a large amount of money by utilizing it.