More About Graphic Novels

Sfsite ran a nice column on graphic novels and their current role in science fiction publishing. The point about Neil Gaiman's graphic novels not being listed on his previous publication credits was interesting. Usually if someone writes something radically different from what they're trying to sell, you won't see it listed on the inside of the book (a romance-sf/f author won't have both his/her romance and sf novels listed in the sf book)... but if The Sandman doesn't fall under the same audience preferences as American Gods, where does it belong?