I see what you are trying to ask, but a piece of writing can contain more than one organizational structure.
It allows the reader to see how the character came to be who he or she is currently, it creates realism in the text, it creates tension between the narrator and the character, etc.
Answer:
Not to trust anyone.
Explanation:
How do i know that?
Derek believed that he was going to be able to get a Gamebox 9000 for free by doing all of these requirements. By the third tier, that is when he realized that it was all a scam.
What is the theme of the story?
This story shows that not to trust anyone. That the main fail of the story.
<em><u>Hope this helps.</u></em>