I think the "ultimate goal" when it was founded was for the Watchtower to be a prototype obedience/mind control religion for the New World Order. At this point, since the NWO isn't going to happen, it's just a billion-dollar a year printing corporation and they're trying to keep it running as long as they can.
Since negative entities, or "demons" feed off of fear, and emotions are energy, it also seems that black magicians have a way of harnessing the negative emotion of fear, to offer up as "food" to their demon gods.