I used to write several short articles per day, over several years. I did it for free and highly enjoyed it, but I was eventually paid to do the same (on the same topic), so I can second the commentor above. Once it was paid, I lost interest over time and saw it as a burden more than a pleasure.

It's hard to make money for creative endeavors, for several reasons, and there are generally two ways to make money from them: put everything into it and hope for the best, or have a "real job" and do the creative thing on the side. Regardless, and personally-speaking, I prefer doing creative things for free because that's the best way to keep my interest-level high.