Because of the nearly balanced ratio of men and women and because of prohibitive cost. Polygyny is the most common type of polygamy, in which one man has two or more wives.
What is Polygyny?
Polygyny is the most common and widely accepted form of polygamy in the world, involving the marriage of a man to several women. Africa has the highest rate of polygyny of any continent. Some scholars believe that the slave trade's impact on the male-to-female sex ratio was a major factor in the emergence and strengthening of polygynous practices in African regions.
Polygyny has been criticised because it is the only form of polygamy permitted in almost all cultures and religious communities that practice it; as such, it violates modern principles of equality between men and women.
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