It would be hard to treat more than one equally to the others. I guess if you got in an argument with one, you could just go to bed with a different one that night! But, think of the jealosy it would breed in the house, and what if they were all mad at you? sounds like a nightmare! When I was in Saudi I asked some of the TCN's if their Islamic law allowed them to have more than one wife, and most answered, "Why would you want more than one?"
Yeah, every wife I've ever had has been mad at me at one time or another, so, "hell" in my estimation would be to have them all in the same house at the same time and all mad at me. No Thanks.
I don't think Christianity absolutely forbids more than one wife. Paul wrote to Timothy, "A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behaviour, given to hospitality, apt to teach; ", but that was his opinion.......and he, Paul, was single.......
Four wives equals four sets of in-laws, four times the PMS, four times the credit-card bill, four times the nagging.
I can sort of understand why strapping a bomb vest on and charging a group of Marines might seem attractive in such a situation.