The idea behind twitter isn't to follow people. It's a good source for people who want an RSS feed, but don't have access to one - e.g. I can get my phone tweeted with updates from here. Now do I want these updates from people i know? No. But it would be nice if, say, I was bored on the train ride home and then suddenly knew that xxx was released, or something. Then I could drive straight to wherever to get it, instead of going home, getting into "home clothes", logging in, finding out that xxx was released today, getting dressed back up, going out... etc. etc.
Or I can buy an iPhone and- er, wait, no not going to, I'll just listen to tweets.