So your point seems to assume that books have a fixed volume of pleasure inside of them, which we extract by reading? In other words, the greater number of book

So your point seems to assume that books have a fixed volume of pleasure inside of them, which we extract by reading? In other words, the greater number of books read, the greater pleasure derived. My own assumptions are quite different, namely I expect that like most other pleasurable activities, you get the pleasure from the time spent doing it, but that doing more of it. For example, if two people both spend 5 hours hiking, and one person hikes 10 miles and the other 15 miles, I wouldn't then assume the latter had gotten more enjoyment from his or her hiking. Nor would I assume someone that had eaten a meal with 1000 calories got more enjoyment than someone who had merely eaten 500 calories.