At a certain stage, you realize that in order to be able to do only that job, you must make someone pay you for it. You must do it in a way (or in a volume) which makes others happy. The fact that it makes you happy is not enough anymore.
I don't think there is an angel and a devil. It is still the same thing. If you like the result of your work, there is a high chance that others will like it. You don't need to change what you do by a 100%. Changing it by 5% - 10% is often enough.