To me, it feels like most feed readers are made by people who don't use RSS, and just exercise their feed reader on a few feeds. I seem to be at 211 feeds with (currently) 13,000 cached entries, organized across a couple dozen categories.

A reader where you'll click into the body under a headline only 1-5% of the time is a totally different beast.

Too true. Not that every user has to be some sort of power user but its rather telling when a reader can hardly scale to a modest amount of articles, has no filtering mechanisms, or methods for organizing otherwise.