I joined one once, after the mount drop rate had been increased, because I overestimated HOW MUCH it had been increased. I saw the mount-in-order, and figured that hey, it must be easy to get eight mounts now. We got two - and that was after several hours' worth of attempts. One of them went to me, since I was second to join, but I felt pretty dirty about it afterwards. I won't be doing it again.