Just though of this because of all the talk of the server merge stuff.
Back when I was in university there was someone I knew who took economics (I can't stand economics but anyway). He said that they had done a case study of Everquest and found that the tremendous popularity of the game came almost exclusively from word of mouth.
Given how many completely new characters I've grouped with lately (I mean like fresh off the boat in the harbour new), as well as all the efforts put in by the devs to make the game better and the player base becoming increasingly supportive of the game I think the game is going to grow very well.
Hah I can even see them having to add a server after or around Christmas.