Comment by ghaff

I don't. I assume it's economics in the sense that consumers are probably inclined to pay less for shorter books, there are a lot of largely fixed costs associated with publishing a book, may even be some pedestrian things like reading a title on the spine in a bookstore. Basically you need some starting hardcover or trade paperback price and work back from there. Amazon has doubtless changed some of the economics especially for ebooks. But, historically, you needed a hardcover you could sell for $25.

I've published a couple of fairly short books I didn't really care about charging for and they just wouldn't have been worth it for any publisher to feed into their funnel.

Only somewhat on point but here's something from the late 90s. https://philip.greenspun.com/wtr/dead-trees/story.html