Perhaps it is not such a big order to begin with. Moreover, Ernan society seems to have moved past the feudal organization pattern. From what I remember, nobility titles are pretty much like they currently are around here. So one can hardly expect knights in shining armour swarming the place. Moreover, if Gerald founded the Order, I hardly dare think what the requirements for joining must be like! *shudder*

My personal theory is that most of the knights keep to the West, where their official quarters (or chapter house) are located. And if the use of the fae for church purposes is specific to Damien's Order alone, as I suspect it is, then it's all the more reason to keep away from the East, where such use was not sanctioned until Damien's arrival. (And the Patriarch seemed most reluctant to cooperate.)