I used to live in an area where the closest libary was a 45 drive, and even then it was little more than an 18 wheeler trailer on blocks. So, even if the library was willing and able to get books from other libraries, it would still take me 1 1/2 hours to get there, pick up the book, and get back home.
I agree that I wouldn't want to pay to borrow books, and luckily I now have access to a major university library, but I still think this service could be very useful to some people.
Carl