You shouldn't do good things because you'll be rewarded for them; often, being the bigger person is met with no reward whatsoever, or even what seems like punishment. You do good things because you are a good person.
It's always been in human nature to write and preform stories. As a kid, one would have imaginary friends or would often play pretend. As we get older, our fascination with the make-believe world never stops. It only matures as we explore other mediums like art, authoring, role-playing, and even acting.