personally, almost every designer bag i've owned or my mother or friends have owned has had issues with it.
all of us have had at least one designer bag that had consistent "issues" that needed fixing.
yes, the boutique always bent over backwards to address the situation and fix the bag and i do believe part of the price is the service you get with the bag, but honestly, i'm another one that believes the line about old tailors working night and day handcrafting the bags is rubbish... lol... sure they are!
i buy into it, but i am very, very cynical about designer bags and their actual "value". you're buying a name and a status symbol and quality? not so much.
actually, i think you're also paying for design, the art of the bag. they are beautiful items to own. but again... quality? no, not so much in my opinion.