You have paid for acid free paper and your books is “built to last” – don’t forget to include this in your list of positive selling points, when possible.  After all, the beautiful book you have produced cost you (and, by extension the customer) more than if it was on newsprint paper!  One place you always have a chance to mention this is in a press release.  You may choose other selling points for space use in paid advertisements and networking time and space.