For me, this is an interesting concept. I love to go into different bookshops when I travel at all. One of my mother's friends travelled with us once and complained about going into yet another bookstore.
Here is another link to the Association of Book Towns: http://www.booktown.net/ with a list of some of the book towns. "A Book town is a small rural town or village in which second-hand and antiquarian bookshops are concentrated. Most Book Towns have developed in villages of historic interest or of scenic beauty."
I'm not sure I would go as far out of my way as some of these book towns, but I certainly will continue to visit local bookstores whenever I go to another city. Do you do book tourism of any sort?