Sites that have fan fiction take a lot of work. Stories would need to be sorted. You would need to check to make sure there is no plaigerism. Do you allow stories that are rated R and NC-17 (here, probably not). Etc, etc, etc. These sites that specialize in fanfic get inundated with stories and I get the feeling everyone here would rather play games. Besides they have to put up with all of us as it is (the wonderful lot that we are!).