The mechanism to do this sort of already exists, in that you really love Lord of the Rings, so you watch the films, you've bought the whole series and given it

The mechanism to do this sort of already exists, in that you really love Lord of the Rings, so you watch the films, you've bought the whole series and given it away as gifts, read to your kid and she grew up to buy them, etc. while none of those streams exist for the Costco cookbook. But even if you're on the rational consumer mindset and want to give the JRR estate an extra penny shaving per word you read, are you really comfortable with the level of intrusive monitoring of your habits this will entail? You want the publisher to know how many times you open their book, which passages you read most, what time of day, etc. to charge you appropriately? What if JRR wants you to pay extra to read about Tom Bombadil because you can't just watch the movie about him, isn't that fair if people are willing to pay?