Why are there so many high IQ societies.​..

I have found this question on ISI-Society discussion board, and found it very interesting.
The problem is that we actually have small number of them with reputation.

Although my societies (Grand and Ultima) look like pure lists, I decided to work on their reputation.
I do not claim that my norms are perfect, but I explained here my norming methods and I'll so accept only those tests whose norms do not differ too much from my estimates.

I also invite others to explain their methods, especially if they do not agree with mine.