Harry Potter and the explosion of Hogwarts’ merchandise

Twelve years after JK Rowling’s final book in the wizarding series, why is everything from Quidditch slippers to Hedwig lip balms still flying off the shelves?
Read more: https://www.theguardian.com/books/shortcuts/2019/jan/04/harry-potter-and-the-explosion-of-hogwarts-merchandise?source=Snapzu