I guess I'm not alone. Everyone goes through phases in their blog reading. First you spend most of your time reading the A-list, such as scripting news and the scobolizer. Then you add a few more interesting (non A-list) RSS feeds to your aggregator. Then you find yourself with dozens or hundreds of RSS feeds. And then you discover you have stopped reading Dave Winer or Robert Scoble altogether.
Personally, I'm at the point where I still subscribe to those two gentlemen, but I find myself skipping most of the content.
In fact, having read Scobolizer for so long, I'm sure Robert doesn't mind losing a few readers who are now subscribed to some of the same sources as him and don't need a human filter.