To quote Evslin on Feedblitz:
In business terms, what FeedBlitz does is make the content of RSS feeds accessible to the great mass of web users who have no idea what RSS is and couldn’t care less about the technology but do want to receive content they care about in a form they do understand – email. Most real people don’t know what a feed reader is. In fact, not many people have a clear idea what a blog is (although almost every web user has heard of blogs).
It’s a sound business proposition, because in reality most people still have no idea what RSS is. Best of luck to them.