I don't put everything in my blog in the RSS feed.
That's because I use the blog to post short items as well as full essays. Still most RSS readers are not able to deal well with the short items. So I tend not to push them through to the feed. If you want the full effect, you need to actually visit the blog from time to time.
Even though this is one of the short items, I sent it to the feed. ;-)
I'd prefer to see everything in the feed.