Interesting. There are some books that are retail-only on Libro.fm (https://libro.fm/audiobooks/9781483080703), but I guess they don't think Sanderson is big enough to let him do that. Everyone seems to be acting reasonably here, I think it's fine that Sanderson doesn't think this deal is worth it, but as a user it's obviously nice to be able to use credits and it seems like most publishers are ok with the tradeoff, as I don't think I've ever been unable get an audiobook through Libro (unless it doesn't exist anywhere).