They're mostly common sense. Fiction for the Vampyres list should be related in some way to vampires, werewolves, ghosts or at least the supernatural. Fluff with sexual content or extreme, graphic violence MUST be labelled as such. Including these warnings is still important. Some mailers automatically MIME-encode or UUencode attachments.
Distribution is simply too widespread.
It makes the document a little easier to read as it scrolls by, even though it adds to the overall length. While the ideas in a poorly spelled document may be very good, if it's hard to read you're going to lose a significant portion of your potential audience. Use the spellchecker, if you've got one. Use a dictionary if you don't. Somehow it's harder to catch mistakes on a screen than on paper, and the darnedest things can slip through if you let them.