They have a long way to go to beat the 8-film adaption of the 7-book Harry Potter series, which has earned $7.7 billion.The Lord of the Rings films have earned $2.91 billion in ticket sales so far, ranking the series ninth among franchises.hough Harry Potter is the box office's highest grossing film franchise, according to Forbes, Lord of the Rings is a serious contender, with new films hitting screens.