So lay off. I believe you're annoyed but you're not the only one Joel is writing for. The guy is doing a good Jon and a lot of us really appreciate the documenting of his experiences. I personally can really relate to everything he talks about. I'm smart enough to know not to take is as gospel but it's damn helpful nonetheless. Joel isn't running a product pricing blog. It's a blog about his own experiences running a startup so be prepared to read about those types of experiences including how he approached pricing Buffer when you click the link.
It's one thing to disagree with everything he's saying and back it up and another to just accuse him of being disingenuous and self promoting because you've read one too many posts on HN today.
I agree the self promotion is good for Joel. I know who he is because of what he has written even though I've been critical along the same lines as the parent. But the parent's thoughts are important also in pointing out to anyone reading this (who is green) that isn't aware of what is going on here. Then they can decide for themselves how they want to listen to or use the advice.
http://conversionxl.com/pricing-experiments-you-might-not-kn...
With all things "startup" (pricing, design, customer on-boarding, etc), there are no absolutes. So articles which offer frameworks that help you ask the right questions or think through the process are generally more valuable and this one does that IMO.
No one is forcing you to read anything here.
Joel built the business and he is sharing his experience. Did you do the same? Do you have a successful business?