It’s not a weird dynamic. There is a threshold where if your partner isn’t making some meaningful amount of money relative to you, it’s better for them to just not work at all than spend 40 hours a week toiling away for a pittance of a paycheck. What is there to gain from having a wife work as a cashier when you make 10x as much as her?
You either want to be a power couple or just get the best partner you can and offer them a comfortable life. The relationships that are an exception to this are usually ones where both people started off equally and then one of them suddenly became massively successful but they still remain in love.
Trophy wife is not just about being stay at home. The term expresses lack of respect toward that wife, whose role is to look pretty and is not expected to contribute, to be knowledgeable nor have skills.
Second, men who earn a lot don't marry cashiers all that often. They want to marry within the same social class. They marry educated women whose earning potential is better then minimum wage.
Third, being stay at home partner comes with price and nowdays people really do it overwhelmingly because of children. The childless stay at home woman is mostly a rarity.
Partly because being dependent and fully paid by him comes with resentment and expectations on his side. The "I am working and you are just spending my money" feeling is one argument away. And partly because being bored, lonely and feeling useless most of time causes issues with her. Their interests and needs become different, so they diverge.
Unfortunately there is no guarantee that a woman with desirable genetic traits is also a high income earner, so in practice men must choose to concede some qualities if they are to have a good chance of finding a wife.
Usually, this means choosing beauty over earning potential, as beauty is much harder to find and then the value of money decreases as you earn more of it.
Seen from another culture: here in divorce assets are split, but not pensions, and there's no alimony. Stay-at-home divorced spouse could easily face financial hardships later in life.
Stay-at-home is not really a concept here beyond maybe a couple of years with a small child, otherwise it's just unemployment.
You either want to be a power couple or just get the best partner you can and offer them a comfortable life. The relationships that are an exception to this are usually ones where both people started off equally and then one of them suddenly became massively successful but they still remain in love.