It may be because I work largely with voluntary organisations and one man businesses but I haven't come accross a web master savvy enough to actually use an rss feed! I target my feed at regular visitors using aggregators or Firefox smart bookmarks.

If you want other websites to run your RSS feed, be sure to have a permissions statement to that effect in a prominent place. Assuming you've created your own feed with your own content, you hold the copyright to it, and any webmaster who runs the feed on another site without your permission would be in violation of copyright. The end users that piatkow talks about aren't a problem, as they're not redistributing it - they're usually the target audience.