I have to admit that I'm a bit of a feed reading fanatic. I have my own software to pick up the feeds and, at my worst, monitored more than 400 individual feeds. The feed reading software I wrote enables me to view my feeds in groups, as well as individual feeds, and as a sequential, date ordered, list of stories. Not only could I read the feeds in this organization, but I could also mark all of the items on screen as 'read'.
That's fine, but to be honest, I found myself spending a long time just marking stories without reading them. Not because I wasn't interested, but because I didn't have time. Ultimately that meant I wasted almost as much time just clearing them out as I would have had I read them.