If we had any evidence of this sort of illegal photocopying going on, I think we'd be more concerned.
We're finding that, with the transactional licences where we pay for what we use, it's really a more equitable way for us to manage our money. Libraries never have enough money to purchase everything people want, and that's when we're deliberately going out and buying what people request. To pay a blanket licence for something people may or may not ever even look at, never mind copy, doesn't seem to be the best use of our funds.
I'd like to see if my colleague has something to say here. She's the copyright expert.