Charles Ives once said that a creative artist should never practice his art for a living. He should do something else for a living and practice his art as a true 'amateur'. Otherwise the work goes, as Ives put it, "Ta-ta for money".
I can relate directly to that, I had to take a 10 year photography break after having worked as a pro.. The economical angle kept ruining any creative thought that I had, leaving me stiffled and confused!