“The feeds themselves are ads for the stories they link to, which are revenue-generators. Anything that keeps people from clicking, that confuses them, takes them off course, is going to drop the click-through rate.”
here here.
There are only three possibilities for ads in RSS:
1. where the feed is an aggregated feed or search result from many sources, then the ad is similar to what the search engines do (but this is a volume game – the individual ad revenue is less than at the destination site).
2. where MOST of the RSS ad revenue is given back to the publisher – so that the publisher can decide whether the ad revenue outweights the potential revenue from the added traffic.
3. Where the RSS feed is full content – although to be honest most people can make more revenue off fancy advertising at the site where the headline links to.
But as Dave points out, if you really think it makes sense for 2. then people aren’t really reading your stuff anyway.