6. Harry Potter and the Half Blood Prince (2009)
Director: David Yates
Budget: $275 million
The entire series of Harry Potter was financed and released by Warner Bros. and, honestly, it was an astute investment for them. Unsurprisingly, the budget kept on increasing with every sequel in the series.
An important reason behind the increasing budget was because of the key characters gaining popularity and earning higher paychecks thanks to the publicity and exposure that they got from the previous movies in the series.
Of course, the money spent on this popular franchise was justified by the box office success of the movie. The movie earned 302 million USD in the United States and 632 million USD overseas. The total worldwide collection was a stunning 934 million dollars!