I noticed the same thing with Louis Vuitton also, they have lots of hand bags. Come one they do the same thing! And some of them are really ugly and expensive, who is buying those things !?! I am sure if I ask LV or anyone interested in fashion will give very good reason for each bag like reasons for twenty different 911s. From the LV perspective; whatever you do, do it with LV bag! Reasonable and good strategy and turn product range into mass :)
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Porsche, LV