I believe the answer is a mixture of the two possibilities with a dash of 'reality' about how beauty is measured. First of all, and this is IMO, the definition of beauty foisted to the general public is not attainable to the numerously average person. The beautiful person is the aberration while the un-beautiful person is the norm, if the measure is a standard of publicized physical appearance. Shame on us! Perhaps this is harsh though. I believe that there is a archetypal/subconscious measure of beauty based on symmetry and proportions. It is to this measurement that people worship even though they cannot attain it themselves.
So what of book sales? Perhaps people who are interested in books are not super models. Perhaps super models are not interested in books. Maybe beautiful people are somewhere else at 8:30 AM on Saturdays. Who knows? I was glad to see so many people interested in reading. (smile)