this is a great idea, which i came across when visiting a potential new AV supplier for our library last week. however, i think that you would have to pick your self contained audiobook title very carefully.
for example, take this guy who is wearing his da vinci code book like a medallion, and is clearly very happy with it. not only is dan brown fan a target for illiterate bogans who want to rob him so they can also say they have heard the book and seen the movie. he is also a prime target for book elitists, who are likely to kick the shit out of him for his poor taste in reading.
[note that there are some better titles, such as the hitchhikers guide to the galaxy and the life of pi]