Joining other IQ groups

Have any of you joined or considered joining other high-IQ groups, like Tops (99th percentile) or Triple Nines (99.9)?

I checked a couple web pages out, but lots of them seem kind of like low-tech, old-style list serve sort of things.

Any recommendations? I'm 99.7th percentile, so I'm curious about groups up to that point (no Triple Nines for me!)

I have been a member of Intertel (99th percentile) and ISPE (99.9). This year I let both those memberships lapse, since I found I wasn't getting anything out of them. Both have email lists that are tediously argumentative; both have newsletters (ISPE's is a "journal") that contain virtually nothing worth reading. (All this is IMO, of course.) The real problem for both groups is that there isn't really "critical mass" in terms of membership, so it is difficult to find people who share your interests. (The email lists, on the other hand, tend to be all about politics and economics, in which the same positions are staked out by the same people over and over for years and years (literally).) Being a Life member of Mensa, I can't quit, but actually I enjoy the SIGs and a few of the activities, as well as the Annual Gathering.

But most of those groups are not that expensive to join, so if you're curious, I say go for it. It may turn out that you find something of interest to you in them -- and I don't have experience with the particular groups you mentioned (though there is considerable overlap in membership among the groups).

Ugh. I hadn't considered the lack of critical mass leading to few people who actually share my interests. Also not interested in listening to people argue ad nauseam about politics.

As soon as I joined mensa I received an invite to join Intel, but I did not pursue it. It just looked too small, and I had no idea if my old SAT/IQ scores were high enough to get me in the door. There was no way I was taking any test.

Mensa is large enough that I knew, no matter where I moved, I'd be able to find a local group.