Yes, as I wrote it does un-clutter your news feed and other benefits beyond profitability. I was posting about another less apparent benefit that works in Facebook's favor. And yes math is very beneficial to the user in most cases and I didn't mean to give you the wrong impression about it. This post however has more to do with the psychological impact of the 18% visibility of your social network and its recourses, not the math that is used to calculate what and how much of it to show.