Thanks for the comments. What you mentioned is indeed Vincent's primary concern but not his only concern. Even if most women of this world are good how many bad ones would it take to cause a lot of damage? They could even tinker with the men's memories so they don't realize they've been abducted and then sell them to women who desire a husband.

There are other counter pressures however to encourage treating the men well. The duplication of traits from a lesser wife to an alpha wife being one of the big ones. This requires a certain connection between the husband and alpha. Though if men were more plentiful there may no longer be any lesser wives but a simple duplication of traits from two women that have something the other wants.

Another point of contention is typically if a woman like Ellayn had a son and felt he'd been abused she'd probably beat the offending woman within a centimeter of her life if not outright kill her. These women have powerful maternal instincts to begin with. You might have noticed that Vincent lacking any wings only made Ariel want to care for him even more.

Yet the story does show this isn't universal. As it mentions before if all these women were benevolent you wouldn't need guards.