Once I replied, it was too late for you to edit your comment. So I did. :)
Well, as for decreasing the number of mechanical assemblies to maintain in copy machines, I don't think that these machines used to take change. Rather, at the machine itself - and also somewhere at the register - there was a counter. When you were through making copies, you went to the register and paid for the copies in either cash or a credit card. So, yes, you're right in that having a means to pay with a credit card only decreases the number of mechanisms needed. But I'd say that the real goal in forcing credit card swiping in advance of making copies is to... do away with the need for people.
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