It's a good thing. We do not cause any trouble. We aren't hitting the abuse button. We are congenial. We will be left alone. Really. No reason to jump ship and go where many won't find us. Personally my typing is too slow for chat rooms.
As to the troll question ... it is possibly curiousity. Wondering what we are discussing to keep it going. Once they come to check it out ... it is either add a bit of revelent commment or be tacky ... depending on the personality of the troll. Nothing person to us or Tolkein.
The lurkers and there are many. Just like on Free Republic, many lurk for a year or two before a first posting. The quiet majority ... enriched by the more erudite and sapient among us. Keep it up, please. My musings for what it's worth.