JK Rowling earns $5 million a week. The "Harry Potter" author's incredible earnings - equivalent to $8 a second - are from the 375 million sales of the seven books in the popular children's series, a percentage of revenue from the movie adaptations and spin-off merchandise, including toys and video games, according to financial bible Forbes.
JK - real first name Joanne - is believed to be worth around $1 billion and is expected to see her earnings soar even further, with three more "Harry Potter" movies scheduled for release.