They're not "high end" brands anymore. The companies that own the brands have it down to a science, every few years they start lowering one of the more expensive brands down, and the masses start using it as a status symbol, until too many of the masses have it, then rinse repeat with another more expensive brand. See Fendi, Gucci, Swarovski, Michael Kors, etc. The most recent one I noticed was Yves Sant Lauren, with their items badged with an ugly YSL logo.

Basically, if you see middle income people start carrying around products badged (having logos on it is itself a signal that it's not high end) with the brand and sold in Macys, it's being stripped of it's high end status. And then even the middle income people start noticing everyone has it, so it devalues it for them, so the fashion brands need a new company to present as "high-end".