How do you feel about illustrations in your books? Graphs? Photos? Sketches?
Well, it depends. Illustrations in children's books are often the best part. And I'm not against illustrations in the fiction I read; however, they seem unnecessary--I already "see" the characters, the places, the events, in my head. My imagination is enough for me. In fact, sometimes an illustration is unsettling. I've read books before and then later run across an illustrated edition only to be quite disturbed because the illustrations didn't match the pictures in my mind.
As far as non-fiction goes, sometimes graphs, charts, and photos can help me conceptualize the author's ideas, but I've never bought a book on the basis of whether or not it's illustrated.