I don't mind providing Adsense income to people who ask, because it just proves what a web site can do with Site Build It. So many "gurus" talk about all the millions they earn, but rarely are ready to provide proof (not that I make millions...yet! hehe). I don't even mind showing them how it works best on my site, as displayed in my YouTube video.
Showing them how to do it for their own site....well....that gets into mentoring and I charge for that.
Showing proof to others gives me the credibility I want to build.