My writer's group is split into two very distinct camps: fiction and nonfiction. (A third, smaller percentage, are in the "undecided"/"still too nervous to get started" camp). There are four of us who pursue articles, blogs, copywriting, and the like either full- or part-time. The rest are pursuing children's/YA, etc.
I admit I'm biased. I've made some nice supplemental income as a freelancer. I've come to a place where I can't understand why a writer would work so hard at polishing and shopping around a manuscript that may never get published when there are so many other ways to make money from writing. I'm all for creative outlets for creativity's sake, but it's also nice to have something to show for your efforts after all of that hard work. I love, love, love reading fiction, but I think that's because the work is already done for me. I don't have to worry about creating a compelling opening, sagging middles, or crafting characters with distinct personalities. I find it all a bit overwhelming, actually, although I have the utmost appreciation for those writers who can do it well.
I also know a few freelancers who are uncomfortable calling themselves a "writer" when they haven't had a book published. In my mind, you're a writer if you put in the time every day/week to find new (paid) outlets for your work and complete said work on deadline. If you obsess over tracking down a particular source and find yourself jotting down even more ideas or angles on a particular topic, that makes you legit in my book.
I haven't completely shut the door on pursuing fiction a little more aggressively one day, but for now, I'm focusing my energies on articles, blogs, and copywriting. I've had a few ideas for novels lingering in the back of my mind for years, but I find that when I sit down to get started, I get overwhelmed by all of the possibilities. That little nagging voice in my head taunts me as I write: Is this too boring?, Is this character likable?, Is this something a lawyer/doctor/sommelier would actually say?, Does this sound like something I've read before?, so the project stalls. I find it easier to control that voice with nonfiction. I think the creative freedom of fiction is liberating, but if you pursue the right avenues, nonfiction can satisfy that outlet, as well ("creative nonfiction" is a whole sub-genre in itself). But for now, I'm happy to stand back and tell others' stories until I feel more prepared to tell one of my own.
What about you? Are you happy as a primarily nonfiction writer? Or does the nonfiction pay the bills while you secretly toil away at your real passion--fiction? I'd love to know!