Just FYI, IPPI ratings & membership do not provide any liability insurance coverage to pilots, in case it matters to the safety of our site, or our members. Neither does the AUA, which (to me at least) seems very much in it’s infancy as far as rating requirements & training go. They basically rely on you having a USHPA rating to issue you their equivalent rating.
If having a form of liability insurance is a site requirement for our pilots to keep our flight park protected, then a USHPA membership is the easiest way to achieve this goal. I suppose AUA and IPPI pilots could purchase a separate liability policy, as long as they can provide proof to the club that they are covered.
Any changes to the club bylaws need to be approved by the majority of the CSS general members via a ballot, like we did about two years ago. We sent out a ballot with the proposed changes about 30 days in advance and discussed those changes on the forum beforehand.