Pixar is such a legendary animation studio that their films basically come with built-in fandoms, and The Incredibles is no exception.

After all, if you're a parent looking for a Halloween costume set for the whole family, you could do a lot worse than The Incredibles. A little baby dressed up as Jack-Jack? Adorable. It might not be the merchandising bonanza that is Toy Story or Cars, but The Incredibles still has a loyal base of diehard fans—as evidenced by the fact that a sequel was made 13 years after the first film was released. 

That doesn't happen unless the fans are there to back it up.