https://www.washingtonpost.com/technology/2019/11/26/e-books-libraries-are-huge-hit-leading-long-waits-reader-hacks-worried-publishers/?arc404=true
You may not like the article source, but a lot of info included.
I was surprised, this area is growing, and that the pricing is hefty for libraries, along with admin costs.
Of course, 'renting' has been the question at the big 'L'. Just me, but I can't imagine buying 90% (at least) of the Logos stable. Rent, yes. I bet I'd rent at a pretty good fraction of the sell price.