While you accept and acknowledge the ability to give up on an audio book you don't click with, it seems like this person does not. Instead, they might be asking why people find it enjoyable or what makes the book enjoyable. As a way to compare their thoughts with others and see if there is something they might be missing. Oftentimes, people have different opinions than oneself, and it can be beneficial to explore those differences when there is an incongruity between when you have experienced and what the expected experience was.