WHY ARE THEY DOING THIS?????????
Has Hollywood really ran out of ideas?
PATHETIC
It's just kind of been an industry trend lately. If something is successful once, you need to make a sequel, and maybe a trilogy, and if it's still successful (read: turns any kind of profit), make more until you've completely driven it into the ground.
The Matrix, Iron Man, Spiderman, Batman, The Expendables, Transformers, Knocked Up + This is 40, The Hangover, Fast and the Furious, X-Men, Lord of the Rings + The Hobbit, Divergent ... after the Hunger Games.
I can keep going if you'd like
It's been happening in video games too -- it's sad when you look at a release calendar and every game has a "2" or a "3" at the end.