I like where your thoughts are, there is a version of this combination where I live, where most large bookstores will partner with Starbucks and have a cafe in-house. I sometimes buy a coffee just to sit for a while and read.
If I can validate the demand-side, the next step could be to allow users to rent their own libraries to increase the variety available.
You're right, it is primarily meant for Canadian users, where the average price for the paperbacks listed is $20-30 including shipping. This is similar to the retail price in-store.
Good point - None of the books I've uploaded so far are available at any of the libraries in my city. They are either not offered or currently checked out.
Thanks for the link!