It's like the affiliate marketer, the self-help guru, or the Dr. Phils of the world who've made a name for themselves only by selling you and others into it. There are several startup blogs and schools of thought that I'm thinking of here that are no different.
It's like the publishing industry. For every great book or blog you read there are thousands of other crappy ones. People in the startup/venture business who have the strongest track records though are also the same people who write the best startup advice.
That's why I love reading posts by Mark Cuban, PG, Paul Bucheit, Derek Sivers, Fred Wilson, Howard Lindzon, Andy Swan, the list goes on... real wisdom is always hard-earned.