... In 2016, Amazon banned publishers putting the table of contents at the end of the book. Only once that prohibition hit the news did ordinary readers discover that the company's Kindle Unlimited subscription service had been paying publishers in proportion to the farthest page read — perversely, creating incentives to game the system by moving the most often-read content to the very end. One the face of it, nothing is more logical: a novel whos pages one turns convulsively until reaching the end should earn more than one whose readers drift away on page three. Yet by this measue, an encyclopedia whose users looked up a single entry on Xylography would look more thoroughly thumbed than one in which they'd consulted every single entry through Woodcuts.
from What We Talk About When We Talk About Books, by Leah Price
I'm greatly enjoying this book — it's very engaging and I recommend it — this bit had me shaking my head all the way home last night. :)