I was invited to join, back in the day. Turned them down, as I thought them nerdy self-aggrandizing so ‘n sos.
I met a local chapter president once. Man, he was out there. Smart but lost, poor soul.
I don’t think I ever knew anyone in it. Oh wait, my father once knew a guy at work in it. But he was a bit of a laughing stock. Invested heavily in gold in the late seventies, early 80s, as it was peaking, shortly before a multi-decadal slide. He was sort of a mini-trump, always telling people how smart he was.