I once bought into the "if you don't post to your own website you don't have anything valuable to offer on technology" theory but eventually realised there are other things in tech and, shock horror, even the Web, than posting on your own website. I still see it being thrown around as an excuse to dismiss out of hand work that people don't understand immediately and find directly relevant to their specific needs though.

Posting this on my own website, so it must be true.