Earlier quoted context omitted.
The quality difference would have to be substantial. I bring in a very high income for my area, and the thought of spending $300-$400 on a single pair of jeans is pretty out there. An $80 pair of jeans, which will often be on sale for $40-$50 will last me for 2-3 years and are of average quality. It seems to me like one would have to justify these jeans on the fashion/novelty aspect, and not quality/value as it just…
At $200 you can buy Outlier pants (or Mission Workshop, no experience with those though). At $400 you can buy freaking Arc'teryx Veilance pants. That's way too much for something that is just cotton (and not even etaProof or anything interesting).
In other words, the fashion aspect does matter to people, oftentimes more than any practical aspect. (I think sometimes people take it to a silly degree...)
1: http://www.barneys.com/product/vetements-zip-around-straight...