There are an awful lot of books I start but don't finish.
In fact, there are an awful lot of books I start, never intending to finish them!
This may sound like heresy coming from this English major, but in my defense, the books that I check out of the library and only intend to taste, rather than devour, are all of the non-fiction persuasion. Never one to specialize, I've started books on all kinds of subjects from architecture to marketing to parenting to education to cooking to homemaking and more. I like to know a little about a lot of things--and when a title inspires a little curiosity in me, I pick up the book and read a bit, here and there. When I find out what I want to know (or when I find out that the book isn't going to tell me what I want to know) then I'm done with the book.
Books I don't finish don't make it onto my Book List, but that certainly doesn't mean I didn't get anything out of them.