Regarding serial polygamy I've known a woman (at work only guys) who had 11 husbands over the years, and some of Tony Bennett's kids ~ and one of Mel Torme's "extra" live-ins (pretty girl who grew up in the same old neighborhood ~ got entranced by Hollywood and next thing you know she was a sex slave).
In short, there’s not as much polygamy going ‘round as we imagine, and few, if any of the folks who post here have ever met a polygamist,
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I knew several when I lived in Utah, including some in the Mainstream LDS church (the called the sister wives ‘nannies’ or ‘cousin’ or something similar to Big Love).
Once I was even approached by a good male LDS friend of mine (the one who got me into the Mormon church) to be a ‘sister wife’. He was 45 and I was 19. I said no, obviously.
It happens more than you know. The numbers are hard to come by but the estimates are between 40,000 and 250,000 polygamist adults in the US today.