People eat up "lifestyle" brand stuff like crazy. I suspect people just want something special in their daily lives. I get that.
I assume it's appealing to sellers too because it inspires some potential level of loyalty and uniqueness when it comes to their products where otherwise it is "just coffee".
Granted I say that while I sip my Kirkland coffee here at my desk, amused that what was once a sort of semi generic store brand, Kirkland now has it's own apparel with its brand on it and Costco fans love it.
I guess we can find something special everywhere.