37s advice about charging is still quite a niche model for the web though. But I'll resist the temptation to start another 'get users to pay' vs 'advertising debate.
Grow based on your profit isn't really 'run of the mill stock business advice' though. Some businesses take time to build. Some require a few years investment. Some can be profitable straight away. One size doesn't fit all.
If you want the lowest risk sure fire way to make money online though, it's certainly "Find a niche" -> "Create useful content" -> "Promote" -> "Monetize through advertising".
The other thing is that in the several autobiographies I've read, people who create really cool stuff - for example Walt Disney, Richard Branson, Duncan Bannatyne... They're always in debt. They're always running from one thing to the next by the skin of their teeth trying to get the next thing financed. Investing all their profit and more into building and growing. But they're also workaholics as well. So what do they know ;)