Last night I was channel-surfing, and HBO had a show on polygamy (part of the promotions for "big love," i guess) . . . and they interviewed some women who were living in "plural marriage." A couple of them looked exactly like your suburban MILF types. Pretty, to begin with, carefully dressed, and they spoke like educated people . . . and they were very much in favor of it.
P.S. there were also some horror stories, but apparently they're from the 'far out' polygamists, not your everyday salt-of-the-earth types.
So, think about it . . . how would you like someone to share the burdens/joys of being a wife?