Film! Draco is a cute, handsome slightly arrogant bully.. ‘oh how much he cried in the bathroom. Also Tom Felton is so hotttttttt. I am wet’ this is basically his fangirls’ claim. He couldn’t kill dumbledore so he was a great person. This is the most important in my opinion. Every other famous book adaptation was turned into the big screen after the series were already finished. Books gain an immense popularity from films, and once people watch the films they want to read the books. A strong example is the Hunger Games. When the first movie came out, people immediately read all 3 books in 1 week.
Unfortunately, that killed the hype in the long run because people already knew what to expect and spoiled everything over the internet. The first Harry Potter movie came out after the 3rd book. People liked the first movie so read the first 3 books, then they had to wait until the 4th book (which happened to be the book that turned the series on its head). This kept the Harry Potter books alive.