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And this has nothing to do with cultural biases against divorce, and subjugation of women, right?

There was a far lower attrition with slave labor as well.

There's also the aspect that in arranged marriage societies, the purpose and expectations of marriage are different. There, marriage may be an institution for the creation of a stable family for children. If Western love happens between the married couple, then so much the better (this type of love may be catered for by the married people having affairs). But don't presume that marriage has a universal 'love' basis. It can be more like forming a partnership to build a business. Imagine someone from another culture telling you that your startup was a sham because you didn't love your cofounder(s).

This could also be because the social pressure to stay together on people in arranged marriages is immense, and divorce still seen as a mortal sin that would probably result in social ostracism (at the least).