I think it's possible to do both.
analogous example: I'm a musician (classically trained, but also play rock, country, etc). to make money as a musician you usually have to play covers (even orchestras are cover bands if you don't think about it too hard). Does playing in a cover band to make a living remove your ability to write new music, or perform the music that you love?
It's all a question of what you want to do with your time. Do you want to spend your spare time using your skills to make other peoples lives better? I'd say that's pretty admirable, but it's not what everyone wants to do with their life.