Rules
Basically same thing as in the Art rules. Don't post stuff that's rated above T+. In the case of fanfics, however, I may allow it to be posted regardless of the rating if I review it first. I'm a prude, so if I approve it then it's probably safe.
Penalties
Again, same as in the Art Shop rules. Just try to specify if you sell stuff rated M. It'll be annoying to have to kick someone out just because they don't specify in their shop title that the title of the fanfic they're selling at the moment is 'Sexy Naruto Adventure' or something like it.