I think I might not abuse this promise and not demand my money back even if the book was just okay.
Well, maybe I might take you up on the offer if I read 2 or 3 "okay" books in a row, since you say "absolutely love".
I try to be an honest and honorable person but have succumbed to greed at one point or another. As a kid I did steal popsicles inside my pants (ouch) and have downloaded an ebook from the IRC once. Or twice. Hope that helps in categorizing my answer