If I do find I'm skipping posts, either I'm bored or the subjects talked of don't mean much to me. I'm unable to keep up with my friends list well as is, so this may mean I can see whose posts I'm not really reading, and trim my friends list a bit... no offence is intended, especially if it's someone I've just added. Most of the people on my friends list are nice people, but if I'm generally unable to read their posts, I need to do something.
Update: Actually, I'm just in a... not-good mood. I may make a friends list filter instead, and just let people delete me as is necessary. It causes far less mess.