Polygyny was not restricted to Islamic societies though, and was a common occurence accross many societies. It was always restricted to a limited amount of men

Polygyny was not restricted to Islamic societies though, and was a common occurence accross many societies. It was always restricted to a limited amount of men of course, as only the most successful/powerful/whatever could afford it. It does have heavy social consequences, but those might or might not be an issue for a given society, as some were quite successful (ie surviving for a long time, no moral judgement here).