I agree with you. Humiliation is just a possibility. But I see some patterns. Obviously, independent women are more selfish, while dependent/submissive think more in the partner.
I fail to say that nat doesnt looks a independent women. So, humiliation could be explaned in another way: mature' (long time in the lifestyle) couples goes deeper. This is a fact. For experienced couples, humiliation clearly sounds a spice for the relationship.
I think that a heavy game like this naturally try to satisfy different publics. So, It should to bring a path with humiliation, right?
But we will agree that humiliation inside the cuckold pornography is apelative and unreal, producers miss the point.
Humiliation is hotter when the couple enjoy the roleplay together. Particularly, I love the Idea of a woman who fall in love with me becames a bit selfish and refuse sex with me. But I would broke immediatly the relationship If any woman forces me to this. On other hand, is exactly why this turn me on what should motivates a partner to do that. The same rule for any bsdm, including If my partner wants to feel submissive or humiliated by me.