At Read Write Web, Marshall Kirkpatrick explains why he would shell out 50 bucks a month for his Twitter account:
I’m a news writer for a living. Using Twitter, I find news stories to write about. Such good stories, so fast and so often that I wrote a year and a half ago that Twitter is paying my rent. A couple of news tips a month that lead to stories that blow up big on Digg and the investment would be worth it to me.
Kirkpatrick also says that Twitter is far more effective at finding stories than as a marketing tool: