Proponents of polygamy
To set the record straight: the Torah did allow multiple wives. However, the Torah also shows that multiple wives can be far from the bliss some men may imagine it to be. Just about any time we get an insider look at a household with more than one wife in TaNaCh, the stresses and tensions that arise show that a man may get far more than he bargained for when taking on another wife -- even when there are particular reasons for it, like an infertile first wife. We also notice that in situations where there was a Divine direction behind the shidduch, as in the case of Tamar and Yehudah or Ruth and Boaz, the first wife of the men involved was dead and buried beforehand. So even in these unusual cases, the matches were monogamous.
Avraham only took on Hagar at his wife's urging, and he sent her away for the same reason. Yitzchak married only once. Yaakov's circumstances in marrying 4 were highly uncommon, and even though it was necessary, the situation created bad feelings between the two sisters he married. Almost every other man we hear of in TaNach takes on only one wife. And we see that Elkana's situation with Penina on top of Chana was far from ideal. In fact, I've heard that Rabbenu Gershom's motivation in instituting the ban against polygamy may have been inspired by his own unhappiness as the husband of more than one wife. But I have not verified that.
Following up a bit on the search results, I found some different views here: http://www.theyeshivaworld.com/coffeeroom/topic/contemporary-plural-marriage-in-judaism The ones who think it's a great idea seem to believe it is a way to openly have a wife/mistress setup. That reminds me of another lesson in Torah about marriage. Chazal tell us that in the generations before the Flood, the custom was to take 2 wives, one for childbearing and one for pleasure -- in the role of mistress. Of course, even then, the plan sometimes backfired and the one designated as mistress also had children. The people who were saved, Noach and his three sons, had only one wife a piece. Even the animals taken on board were limited to a single mate.
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