Here's a link to a March 30 article by Jarvis Coffin, president and CEO of Burst! Media, that shares my opinion on the whole blind buying thing. It appeared on Media Daily News.
Speaking of Mediapost, here's an article I wrote back in 2Q 2003 on much the same subject.
And this is pretty much my point - the problem has been identified for quite some time now. The fact that it's still a problem indicates that we're deceiving ourselves.