Kathy Sierra's blog post should make you think twice.
Even someone as mainstream as Sergio Zyman says: "The problem in marketing today is that we spend 95% of our time and money on advertising and 5% on the rest of the stuff. What I propose to you today is to flip it around: Spend 5% of your time and money on advertising and 95% on everything else. If you do that, you'll sell a lot more to your customers."
I agree. That's how I discovered Double Loop Marketing.