Decided that blogs (and webpages) that deface outgoing links through a redirector for the purpose of (potential) evaluation of visitor off-clicks are stupid. And therefore unsubscribed from some of those blogs. Even if the content is interesting - if I have to register the clicks on further information with the blog owner first, they can kiss my RSS feed.
Yes, there are sometimes technical reasons why one might want to do this - my link postings have their own GUID, but they are redirects to the original (since I only have a short comment there, which was already included in the RSS feed). But as a general measure? No.