Who Do You Suppose Benefits the Most in a Polygynous Marriage, the Husband or the Wives?

According to a  study of polygamy in Malaysia, "65% of the husbands interviewed would recommend polygamy as a family institution. But only 25% of first wives and about 50% of second wives held this view."  Do you suspect that the lack of support for polygyny among wives of a single husband  is generally the case wherever polygyny is found?