Furthermore, Audible only lets you return 2-3 books self-serve before you have to go through customer service. This small friction is a real impediment to abuse

Furthermore, Audible only lets you return 2-3 books self-serve before you have to go through customer service. This small friction is a real impediment to abuse of the system, and I highly doubt Audible won't refuse returns if you return one every month. I think I've returned 4-5 books total, out of 62 over the last 6 years[1]. All were because either I really didn't like the book, or the narration volume wasn't very well balanced (road noise means turning the volume up to hear the quiet parts, then getting your eardrums blasted out on the loud parts). [1] It's hard to believe that I've spent 35+ entire days listening to audiobooks. That's nuts.