Why Does This Bag Cost Money?

This bag should be free. When I buy a Marc Jacobs bag for $1,200, they should package it in this shopping bag and it shouldn't cost me any more than I've already spent. Like at a department store. But instead, this bag is $750!!!!! I don't care if it's leather, from afar you look like you are toting your stuff in a shopping bag. I know I save all my shopping bags for certain things like dry cleaning or a trip to the post office but would I spent $750 on a bag specifically for those errands? Do I seem like a moron? Cuz that's the only ones who will buy this. It comes in silver metallic which is slightly better, but only slightly. At eLuxury.

Source: bagsnob.com