I don't think it's even that important to moderate Completely Unrelated. The only real problem with it is that it gives people who don't contribute anything to the community a way to up their post counts. I think it makes sense that mods should have the ability to moderate Completely Unrelated so as to deal with "destructive" posts and spambots, but if posts in Completely Unrelated come not to affect post counts, then no more should need to be done.
In any case, I don't wholly agree with the "this forum is becoming just like every other Final Fantasy forum" argument. Completely Unrelated can hardly be considered to be a part of the forum. As long as the other boards maintain their quality, it will be fine as far as I'm concerned. (Who knows? Maybe, if Completely Unrelated became a no-count board, people would start putting their Completely Unrelated threads in General Discussion specially to keep their post counts going. In that case, it'll be obvious that they're in it for the post count.)