http://edition.cnn.com/2015/06/17/africa/the-king-with-100-wives-cameroon/index.html
Some people(Especially men) envy polygamy. But, this extreme example may make them concerned.
The difficulty of having 100 wives is that the husband has to treat each woman equally. In this case, if the man meets each wife every day, each wife can meet him 3 or 4 times per year.
I'm afraid that each wife feel isolated.
