My wife's father is married to two sisters. The only problem is they can gang up on you in fights.
Living in the US you forget the places in the world where multiple wives are allowed if you can feed them.
The other issue is trying to remember which kid belongs to which mom after having multiple kids with four wives. Forget about birthdays.
You need a bus to if you want to take everyone anywhere. It takes hours to get everyone ready on time. Still there are stories of men getting new wives every five years just like a new car.