This is a perfectly valid strategy for a small business or a bootstrapped startup. For example, try to figure out how many different businesses 37signals is in.

This is a perfectly valid strategy for a small business or a bootstrapped startup. For example, try to figure out how many different businesses 37signals is in. I'm aware of online software, books, training and advertising, and there's probably a couple of others. As they put it: "Sell your byproducts." This strategy probably doesn't make sense for a funded startup, however.