Here's an insightful quote from author Holly Lisle (www.hollylisle.com) who has a terrific and unbelievably busy writing life, full of advice and help, even while she maintains her career writing fiction. We all should be so prolific and helpful.
"People write for different reasons---they have different goals in mind. And I can't say that the writer who has made 'make a million dollars per book' his primary goal has anything to be ashamed of, or that the one who wants to touch the lives of each of his readers and leave them with something more when they finish the book than they had when they started should be nominated for sainthood. Personally, I wouldn't mind doing both, and I'm neither saint nor villain. I do know that the thing that keeps me happy as I write is not the hope of a big payoff but the hope that somehow I will someday manage to reach inside the hearts of my readers, as Ted Sturgeon reached inside of my heart, and twist. And that those readers will say, as I said, 'Oh. I understand more now. I'm more complete now. And I want to give back.'"