There are other issues with infinite scrolling (such as not being able to re-find your place, etc), however dissatisfaction is not one I experience. Maybe it's because I don't usually finish things for the sake of finishing. I'm more inclined to keep reading something until I get bored or want to do something else. I usually don't make it to the bottom of the front page of Hacker News or all the way through about 3/4 of news articles.