I passed the Mensa test (from an ad in some magazine) when I was 12. I was attracted because the ad promised group discounts for members on a number of things. I did not join. For the record, I have NEVER known anyone who didn't pass that stupid test. I think it's a scam.
Secondly, over the years, I have met a number of actual members. Without exception, they were tedious social retards who, while they may or may not have a high IQ, lacked social and emotional intelligence lacking wisdom and insight and were bloated, boring, social bottom feeders whom any one of us would avoid like hell in any public setting.
Mensa sucks. Their members suck worse.