From the Leaders’ point of view, as under-shepherds of the Lord Jesus, it marks out the flock for whom we have particular responsibility. This gives us focus to our work and prayers. From the individual Member’s point of view it offers protection and accountability. From the point of view of the whole Membership it is a statement of mutual commitment and partnership.
Here is a link to the 9Marks website which details some more benefits of Membership.
Here is a copy of our Membership Covenant.