What do you mean "to deal with"? There's a lot of misconceptions about marriage, having to "manage" your spouse is one of them. You don't, they're their own person, they can take care of themselves, and if they're dependent on you it's not a healthy marriage.
A healthy marriage of two people treating each other as equals takes a lot of communication, and that almost certainly can't be scaled 10x, nor do the same principles apply when someone is only getting 10%.
In traditional polygamy, the man with 10 wives would be the head of household for 10 wives with competing interests, so it does start to sound very managerial.
I recall reading an interview of a higher-up in the Saudi government. He was asked why he doesn't have multiple wives. He replied that he doesn't have enough free time for that lifestyle. His grandfather was a tribesman: they raided other tribes about once a month to get what they needed. His father was a farmer/grazier: he worked about once a week. He, himself, is a government official and works most days.
