Look into the Adsense case studies. Some of the folks (or all of them?) live completely on Adsense.
They are just too busy to share anything.
Or too smart to share anything.
On the other hand, anyone who lets AdSense identify their successful site in a case study isn't all that smart IMO. That's just an invitation for lots of leeches to put up a competing site on the topic, copy the layout, copy the content, etc.