People tend to marry people that they have things a common with, that they work with or live in proximity with. I don't think many people have checklists where

People tend to marry people that they have things a common with, that they work with or live in proximity with. I don't think many people have checklists where they evaluate potential partners based on education, income, looks and so on and consciously choose the best match. People just fall in love. The social classes just don't really mix that freely and it is not surprising people tend to stick to their own class. Yes, you can find all kinds of people on Tinder but most relationships don't start there. Relationships are often build on shared goals and having things in common and having similar social status, class and income helps.