Limited options for hardcover books with ISBN
I have published hard and soft cover versions of my book (6x9). I attached ISBNs that I bought from Bowker. When I later decided to change my hard cover dust jacket from Glossy to Matte, and the interior paper from cream to white, the attached ISBN got dropped. I was told by Lulu support that that's the way it is. Any change from cream paper, blue cloth, gold lettering will drop the ISBN. My question is: Why? Why would Lulu not attach my ISBN to a book with white paper (when the soft cover book has white paper). Why would Lulu not attach my ISBN when the cover cloth is gray instead of blue? Why would Lulu not attach my ISBN when the cover and spine lettering is white instead of gold? Why can't an ISBN be on a matte finished dust jacket. I see other hardcover books with the characteristics I want, and they have ISBNs on them.