by Takuma Tomomasa , A_Itoh
Available on mangabuddy for reading, and for sale at https://www.amazon.com/dp/B0BT6V7CMM
It's called "preselection bias". Women (generally) don't want men that other women don't want. That means that (generally) women would prefer to participate in a harem with other woman than have the exclusive attention of a man who doesn't have other options.
This becomes even more extreme when you add things like wealth, power, fame and feudal society that's constantly at war. 3 wives? I'm surprised that he doesn't have 20 concubines as well, just to make sure that the family has enough heirs.
Since women are the sexual selectors of the species, hypergamy demands competition between women which means that simply by philosophical deduction and without even citing a statistic, women prefer men who are valued by other women more than men who aren't (i.e. preselection bias).
And let's be clear, there is a difference between instinct and behavior. Just because instinct might pull you in a specific direction (like how a man is driven my instinct to either kill or mate with everything that moves) that doesn't mean that our actions reflect that instinct. However, as we fall further into degeneracy in our modern era and experience new levels of absurd hedonism, we are also seeing new and absurd levels of instant gratification culture which tends to bend entirely to the whims of instinct.
"positive aspects to them that are easily represented on a 1st impression like money, influence, power and so on. Although, i would argue that men aren't that different in that regard."
Men are very different in this regard and don't want the same things that women want.