Agreed, he has the experience needed to make an "over-night success". His Mensa membership and thereby accompanying massive brain doesn't hurt either.
I knew someone who went into it with these expectations only to find the community largely concerned with their own intellectual superiority. As your IQ is explicitly a score based on the relation to others' IQs and only implies you might be capable of meaningful contribution to society, these groups may not fulfill their intentions. Again this is second-hand; some of you may have had a different experience with Mensa.
I have heard of better societies that provide a good forum for communication between profoundly intelligent individuals (Glia, IQuadrivium, Triple Nine), but I would argue the greatest benefit for IQ testing these kinds of people is to provide resources for the undiscovered geniuses. In the vast majority of cases they are recognized as a result of their schooling, but all the IQ-test rage is worth it for the rare diamond in the rough whose unconventional nature disguises his abilities. I believe it was Da Vinci who said: "Thousands of geniuses live and die undiscovered- either by themselves or others."
I don't know if there are any benefits for being a member in other countries; I fully endorse finding like-minded people and developing new networks and friendships, but I don't see that happening in the local Mensa environment.
I know some people who are quite involved with Mensa in Germany, and they seem sane, so far.
When she moved to the UK and signed up with the local branch here, however, she was horrified by what she saw: self-important pretentious people lazily philosophizing about things they knew nothing about, with little intellectual rigour. The magazine still comes every month, but she wants no more part of it.