The claim that Fifty Shades of Grey and, I don't know, Norman Mailer?, Chuck Tingle?, are less common on book shelves and night stands than cyberpunk paperbacks

The claim that Fifty Shades of Grey and, I don't know, Norman Mailer?, Chuck Tingle?, are less common on book shelves and night stands than cyberpunk paperbacks seems obviously wrong to me. Perhaps you could elucidate further on this subject? I'm mostly into books from 1800-1985 or so and don't know much about contemporary literary fashion. Edit: Jean M Auel was extremely common in occidental households a few decades ago, especially the first and second books about Ayla, I'd wager much, much more common than cyberpunk. Same goes for books by Alex Comfort.