Mensa and other high IQ societies consist of people who have enough time to dedicate to being in a high IQ society.
That should tell you enough about the motivation and mindset of the people in it.
Like everyone there was probably technically intelligent, but they've convinced themselves that that alone was enough to lead them to the land of milk and honey. Like they say, hard work beats talent when talent doesn't work hard. Being intelligent isn't enough, you have to acquire knowledge and you have to apply that knowledge.
They also consist of people who (stupidly) attribute a lot more value to IQ than it deserves. I got a 135 on this test, I am not smarter than Richard Feynman.
I bet that IMO/IPhO medalists are a LOT smarter than Triple-9 people.
(Yes, I know that Feynman underwent an actual physical examination, and his score was probably lowered by his poor English skills, but my point still stands: smart people typically don't have extremely high IQs.)
C'mon, Brooklyn is an accent not a disability!
Being at the 99.9% level is impressive to be sure, but it doesn't seem to translate to much tangible benefit in our current society.
Basically, they tested people from all walks of life and they found that the skill with the highest threshold was about 125-130.
People with higher IQs may be able to do or learn things better or faster, but it's possible for anyone to achieve that level if they put in the work. IQ just tells you basically how much work it will take.
I passed it and I was part of the the society. I found it quite weird because the rest of the people didn't look like "smart" or "intelligent" or whatever you could think of Mensa people.
At the end I just decided that they (we) were good at identifying patterns. I stopped paying after one or two years.