It’s official: nobody sells more books than Oprah. “A new study confirms what many already knew: Oprah Winfrey’s book endorsements are good as gold to publishers… Of [the 45 books Winfrey recommended to her ‘book club’], only 11 had been on the bestseller list before her recommendation, and none of them had gone beyond No. 25. Of the first 11 books that Winfrey picked, all went to at least No. 4 within a week.”