Each fall, we get near full renewal of our 500 existing family memberships and we do NOT keep waiting lists.
Twice in the last 4 years we held new member drawing/auction events on Jan 1, 2016 and again Jan 1, 2019. We added approx. 50 memberships between these two events and all new members were sponsored by existing members (process detailed in Nov. renewal docs). We also upped the vetting of new members by requiring proof of NRA membership and possession of a carry permit.
We don't open up new memberships every year, but wait until we have 20-25 openings available to make it worth the effort for all concerned.