I do see somehow things differently.
In my introduction to Newsmastering work I always referenced automatic aggregation, filtering, deduplication and publication of topic-specific news channels. This is the way that it needs to work at the roots.
I have also said that the most powerful of all the technologies that make up the creation of such channels is the human touch, appended as the last, critical decision step to a fully automated process.
So, newsmaster feeds, or better yet, RSS Radars as you aptly call them, can be either or. You can go for quantity and have RSS Radars that produce a lot of content but, just like the Myst ones, or some pretty funny ones in Chris Pirillo newsletter, have also quite a few non-relevant items showing up in them.
With time, and the use of heuristics and some minimal form of articial intelligence such newsmastering technologies should be able to learn pretty well what a newsmaster would select, edit or reject, and could therefore act consequently.
How much does Myst Technologies price a topic-specific RSS Radar for a company like yours or mine?