it's a lot easier to copy a digital file before returning it for cash than it is to reproduce a toaster. this simply is not feasible. it's why software stores only accept goods that are unopened.
moreover, the practice certainly wouldn't 'stunt' piracy. in fact, one could argue that this would increase the flow of rogue data onto the internet, since it would cost the original uploads a fraction of the retail value of an item to acquire it for long enough to create a copy.
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