Here's why:
* Massive popularity: The book became an instant bestseller and remained so for years, selling millions of copies worldwide.
* Adaptability: Its enduring popularity led to numerous adaptations, including the 1971 film starring Gene Wilder and the 2005 film directed by Tim Burton. These adaptations further boosted the book's fame and profits.
* Enduring appeal: "Charlie and the Chocolate Factory" continues to be a popular choice for children and adults, ensuring continued sales and royalties for Dahl's estate.
While other Dahl books like "James and the Giant Peach" and "Matilda" were also incredibly successful, "Charlie and the Chocolate Factory" is considered his most financially lucrative work.