I suspect it was far more valuable in pre-Internet non-population-dense America, where it was one of the few effective ways to connect with other smart people. It is extremely obsolete now. But "they" (whoever "they" is in practice) publish some nifty puzzle books.
At the time I'm writing this, yours may be the only answer in this thread that doesn't try to signal moral superiority to Mensa members by piously insulting them. (There are a couple of other comments that I would consider borderline -- not overtly insulting, but carefully suffused with cynicism.)
