I don't know anything about the organizations for super high IQ. But I am willing to speculate a bit!
I'm sure you are all familiar with Mensa, the society for the top 2% in intelligence. I have been a Mensa member for many years, and I actually met my husband through this group. It's not a bad social scene for a geeky young woman. Mensa made me feel "cool!" Back in my single days, I also registered with one of the marginally higher IQ groups for those in the top 1%. I found that that club's membership was basically just a subset of Mensa members! They had fewer people and less to offer in terms of activities, so I let my membership lapse after that one year. I suspect that there are some high IQ groups that actually offer more than bragging rights, but for most outside of Mensa (which has the numbers to really do a lot) it is probably a challenge just to get enough volunteers to get a newsletter out!
