Sadly this does come as a revelation to many because of the emerging church and new breed new evangelical pastors regurgitating each other’s ideas within each camp. From Christian Post:

More than 1,500 pastors across the country and around the globe have pledged not to short circuit their sermons with someone else’s.

In a new campaign aimed at putting the centrality of the Bible back into a preacher’s message, "The Preacher’s Pledge," introduced by SermonCentral.com, has been signed by pastors from over 50 nations so far.

"We introduced The Pledge because we think preachers must engage the Bible in their sermon preparation and not simply short circuit the process with someone else’s study," says Ron Forseth, general editor for SermonCentral.com. "Our site is a valuable supplement but not the primary source for a sermon. God’s Word is."