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this guy i know at work his hobby is working with wood. and he is very good at it plus he went to school for that. his friend ask why he doesn't use those skills in a job in that field. and he says a hobby is hobby once it's a job it's no longer a hobby and more than likely you won't like it anymore or enjoy it like when it was just a hobby.
is this like that glass is fuller/empty question. but i always see it as if you enjoy something and make it your career wouldn't that be awesome! working and getting paid in something you enjoy.