Is threefold.
First, I do not ascribe any actual value to a brand as a visible item. So I refuse to blow money on something because it has a visible branding, only because it is well designed.
Second, my fashionabley attractive clothes spend a lot of time in the closet because I'd look funny as a well-dressed nerd. I'm not a model or an important person and would rather not be remembered for my clothes, rather who I am.
Third, fundamentally, I would rather spend $100 on gear for my photography or electronic projects or sculptures or whatnot. Or, hell, on sexy nearly-nothings to hire models to dress themselves in.
Ordinarily, I'd shop at Kohls or Sears, but we have some Macy's coupons, so Mrs. Wirehead sent me here. I am quite sure that jeans, which I need more of, are not going to be purchased here. Not working.