I am involved in many projects that include writing. Recently, I have written curriculum for E. African educators in Science. I am a researcher for a doctoral candidate and I have my hand in several projects writing and editing. Amazingly, I don't think I have ever taken one cent, shilling for my work.
I guess I must be an ok writer because we have sold or distributed (well someone got the money) books on 3 continents.
Bottom line I write because I love it.