CASA had a small safety seminar at our local aero club a while back, and the most notable presence, in a bad way, was a bloke whose clear mission was to heckle. He muttered, scoffed like a schoolkid and jumped in with off-topic points intended to put the speaker off. After a while someone turned to him and simply told him how rude he was being, which shut him up thankfully.
My point is, these things are only as useful as the intentions of those who turn up, so if you're already pre judging it as pointless, don't bother. A simple explanation of exactly how a CASA rule is degrading your operation or business, which they can then work to address (let's hope), beats 10 rants any day.