Will one ever want their sister/daughter to be married to a Guy who already has 3 wife or will fulfill the quota for 4 in future?
Nobody will do that if they have a choice. But there are so many orphaned , widowed and women in abusive families who will opt to be wife of a person who already has three wives to get out of their predicament , in hopes of a better lives than they are already in. There is too much desperation in this world.