Urbane educated co-wives are married to rich affluent men to upgrade their social and economic status, a safe haven from
unmarried single status.
Time has changed. In Africa, 60 yrs or perhaps beyond, it worked in rural traditional setting when polygamous men
married 3-4 wives, have many kids to work labour intensive farming, cattle rearing etcs. A move from rural to urban town weakens makes it almost unattainable, perhaps unattractive. Essentially, certain traditions and cultures should be left to die out. Ideally,
husband and wife strong bond works in monogamy.
It cannot work in polygamy when they are unlikely to satisfy 2-3 wives sexually, perhaps add financially. She might
be tempted to look outside her marriage for those pressing needs she can't get in the marriage (allegedly) as commonly observed in contemporary society. Again, don't come for me unless you've not been reading trending DNA news.