Because of moolah.
... People who have seen pre-release surveys say that "Toy Story 3" is certain to have the biggest opening for a movie from Pixar Animation Studios, beating 2004's "The Incredibles," which started with $70.4 million in the U.S. and Canada.
Thanks to strong interest among all audience segments, as well as 3-D premium ticket prices, the movie could provide Pixar's first $100-million-plus opening if pre-release tracking is on target ...
So $100 mill is the prediction. In a few days we'll know if the forecast is on the money.
But anybody who wonders why big companies make second, third and fourth installments of movies filled with well-loved (and lucrative) characters, isn't living in the 21st century.
They're living at a small animation studio on Hyperion Avenue, circa 1938, listening to a filmmaker who didn't like sequels.