I got a question for you: In 2011, screenwriter Noxon told Collider.com that plans for an imminent sequel were shelved due to the disappointing performance of the first installment at the box office.

Answer this question: why is there no i am number four sequel?
Let's think first:
The important part for answering this question is: In 2011, screenwriter Noxon told Collider.com that plans for an imminent sequel were shelved due to the disappointing performance of the first installment at the box office.
Therefore, the answer is due to the disappointing performance of the first installment at the box office.