Why Joel Spolsky and Jeff Atwood are Brilliant A-Holes
codingcontext.com
codingcontext.com
Just because these two are putting on conferences does not mean that they didn't create very valuable resources.
I think this author is also wrong about the costs of putting on a conference, but the key is that if the conferences don't offer value, they won't last and they won't get attendance. A conference is a product just like anything else, if the product is bad, people won't pay for it.