Because they will out-sell to whoever things this is cool and not stupid or arrogant etc. Also because according to this US Vogue feature
According to a 2012 study by theĀ Journal of Research and Personality, it turns out shoes are considered a āthin sliceā of perceptions of a person, and can be an indicator of a wearerās wealth and social status. (Fun fact: Liberal hippie students love a good sandal moment.)
But where does the dirty shoe fall on the spectrumāa deliberately dirty shoe, nonetheless? Wellesley College assistant professor of psychology Angela Bahnsāone of the authors of the paper āShoes as a Source of First Impressionsāānotes that a less-than-spotless look doesnāt imply mere slovenliness.
āOur research found that having neat and tidy shoes tends to correlate with the person being anxious, conscientious, or politically conservative,ā she writes in an email. āSo the choice to use dirty shoes on the runway might be an effort to portray an image of being calm, not uptight, or politically liberal.ā