God is a good and a most mercyful God, who's love is unending, and His mercies reached out to all they that seek him. So I do always advise that what ever we do, we should always seek to know the mind of God. Polygamy is not what God want, although men can choose and decide whether they want to be a husband of one wife or many wives. But to God it is not His will.
Some people take another wife because their parent did same. But any man who wishes to be very responsible, I think just one wife is enough. Some people make so much mistakes in these things, And I know that when we come to God in prayer and demand for mercies, he will hear, answer, purify and sanctify us. Amen.