OCC 12
And that's the other thing -- what happened to mass market paperbacks? My shelves are built for (several hundred of) those; a trade book just messes up my shelving system. And those were already high when mass market books were still only starting up the slope.
And now, even Kindle format is up, for books that come through a traditional publisher; I see new work for $16.99 for a book I wouldn't even actually own (Amazon can pull a Kindle book right off your reader any time it's connected to wifi -- use software like Libre to make backups of anything the least bit controversial you read on Kindle and learn how to side-load). My partner is an author on Kindle Direct Publishing, and sells for no more than $6.99 for books up to 100,000 words or so (less for shorter work), and puts everything on Kindle Unlimited (and for 100,000 words, makes more on KU than if you bought the book).
The other problem is that Watt-Evans (or his publisher) doesn't seem to put his books on KU at all, demonstrating that they still don't understand how this stuff works. No, of course you can't make $16.99 when someone reads a 60,000 barely-a-novel, but you get MANY more reads, which means more readers will look for your next book, or your backlist that they haven't seen already, and some few will buy the book after reading it on KU. Gatekeeping stuff like this is like pricing eggs at $15 a dozen. Your margin is huge, but you don't sell many eggs...