That's obviously true, especially in the case of churches that preach so-called "prosperity theology".
I read about a branch of a mega-church going up near where I live so, I checked out the pastor when he appeared on TV and looked at his church's website. I noticed that he seemed to be preaching mainly an economic/success message with just a few Bible verses thrown in occasionally. His church's website has links that go directly to his personal website where he sells books, CD's, etc. (and presumably pockets the profits thereof.) And what kind of church is called the "Champions Centre"?
My overall impression was exactly the same sentiment that you posted, that these guys are in it for the lifestyle.
Another thing I couldn't figure out is how this guy built up a mega-church when, based on what I saw on TV, he seems to actually have very little charisma.
Of course I am a cynical atheist. But I did all this research with my believing son, who felt the same way.
You seem to be located in Seattle area.
Try http://www.thecitychurch.org/. Is not my home church either but I enjoy their services occasionally. All sermons are strictly scripture based. You may not understand it all being an atheist but in support of your son's spirituality, I'd suggest you give it a shot.