Amazingly, that's not all which guarantees Rowling's bank account stays mighty. There's also the Wizarding World Of Harry Potter which have proved immensely popular after opening at Universal Studio theme parks in Orlando, Hollywood and Osaka, Japan. At Warner Bros. Studio in London, there's a Harry Potter attraction there too.
The hit Harry Potter and the Cursed Child is set to hit Broadway in 2018, having been a major success in London, reports The New York Times.
All of this looks set to ensure that Rowling will stay on any list of billionaires, and she won't need to curb her charitable giving any time soon.
Curiously, despite being included on the Forbes list back in 2005, Rowling told Katie Curic; “I’ve got plenty of money, more money than I ever dreamed I would have. But I am not a billionaire.”
She hasn't talked about her wealth since.