After putting Dilbert online for free, Scott Adams reported, "Free is more complicated than you think."
In this talk, Tim O'Reilly does the math: just how many page views do you need to support an e-book with advertising? How popular does your blog need to be? What percentage of customers who sample a free product end up paying for more? Which online business models produce revenue comparable to existing print models? How much will others need to grow to fill the gap?
Free is a strategy, not an endpoint. It's time to stop wishful thinking and build business models that work.