I was told you don't reveal roles on joining the Anama so that the hunter can infiltrate them. That's a cool thing, but I feel there's a problem with it. (besides the fact that, technically, if he lives an Anama meber survives)
I don't think the Anama priest has much incentive to recruit more members. recruiting someone reveals his role, (or at least his membership) to them, which is something of a risk. What does he gain that he cannot through standard cooperation? The new member has no obligation to help him. He learns nothing new about the member. Sure, the extra members will help him to outnumber the mages, but that can be achieved Micklebur style. (i.e. killing them all)
EDIT: Recruiting should still be a risk, I think, but there should still be a small extra benefit to gaining new members. How about allowing the priest to negotiate mebership as part of a trade. A kind of membership fee?