I'm very confused by Spotify's audio books though. Can't buy or even see the price through the app, which can't be good for getting people started on it. I then

I'm very confused by Spotify's audio books though. Can't buy or even see the price through the app, which can't be good for getting people started on it. I then went on the website version, and the Sanderson novels I can find are £29.90 (as are most of the others I looked at). I don't listen to audio books, is the market price really 4-5x the hardback?