Taking off my staff hat for a moment, and speaking just as an author, I would not be terribly comfortable leaving any of my original work up here if it were made easy to download it. My fandom stuff, well, it would be irritating as the hells to find it published elsewhere under someone else's name, but it's not something I could ever have published on my own for profit anyway. My original work, though... I'd be devastated. Seriously. Some of my oneshots in Originals are "outtakes" and character development bits for things I'd like to submit for publication.
I understand that the vast majority of people download something to read with no nefarious intent, and would no sooner plagiarize than they would kick a puppy. I know nothing's foolproof, and a determined thief can copy and paste just as well. I just don't see the point of a fiction archive making it easy for people to steal, not when that archive hosts original works.
That's strictly my opinion as an author, mind you, and it carries only as much weight as that of any other user here.