There is a very big difference between knowing something and being able to act on it. By reading this forum, you undoubtedly know a whole a lot about entrepreneurship. Are you rich yet?
I don't write articles on entrepreneurship and technology startups, either, if that is what you are trying to say. I don't purport to be an expert on entrepreneurship through articles from an authoritative sources like the NY Times. It's a matter of credibility when someone who supposedly understands how a system works falls victim to that system by his/her own actions or greed. If PG did a startup tomorrow, attracted funding, and then burned through it by buying Aeron chairs and Nerf toys, how much would you believe in his credibility as a writer then? I would be a bit more cautious.
Would you believe Evan Williams when he writes about startups? He did his "10 rules for webstartups" (http://evhead.com/2005/11/ten-rules-for-web-startups.asp) and then broke all of them with Odeo, which, not surprisingly, failed.