Share 'Separate Feeds'

Hi everyone! I have a new question: What is the benefit to having a separate feed for one's podiobook? I'm starting to think about my author website, and my plan was to include a link to podiobooks.com for those interested in listening to Dreaming of Deliverance. But I know some authors also allow people to listen directly from their website. What is the reason for doing both? Am I missing somet…