I do it for practice and criticism. not many people read online original fiction. I don't either. When I write original stuff I want it published, not up for free to be stolen by someone.
Me and my friend are working on a novel series right now. We want to get it published once we're finished.
Yeah, I'm downloading the Dramatica Pro now.
[for free...lol. gotta love the internet]
I'm an aspiring novelist so a program like that will help me a lot.
I only use fan fiction as a means of practice and getting better.