"What is the point of you?"

Analyze the ramifications of time travel in the First Fifteen Lives of Harry August by Claire North. Consider what the end of the world means for members of the Cronus Club, and what would motivate a person with the ability to relive their lives an infinite number of times. Especially consider characters outside of Harry August's time line. What drives the universe forward within this theory of time? If people and events change only a little from life to life, what is the point of the club?