Interesting.
The plus side is that this machine can go anywhere. It will attract screaming kids who will see an elabourate Batman machine, and be drawn to it (kids that normally won't go into a comic book store because 80% of them smell like cat pee). The kids will bug their parents.
I would be eager to see the design of such a machine; that would be the key marketing point. I wonder what kind of product selection you can offer within the confines of something the size of a pop machine, and what your price points would be and how would you handle payments (vending machines don't tend to have credit/debit readers in North America, so you have to think about how much people would be willing to pay for something coming out of a machine; people are conditioned to think of machine purchases as being 2$ or less).