Exorcisms for all! But do we need them?

You too can get an exorcism! Just google the word “exorcism” and you will find a paid advertisement by a pastor named Bob Larson, whom you can e-mail to arrange an exorcism. Not only that, you will be filmed for his new reality tv series!
Am I the only one that finds this odd? And how did a centuries-old spiritual rite go to on-demand service advertised on the web?
The demand for exorcisms have gone up dramatically in recent years. In the early 80's, the US Catholic church had one sanctioned exorcist. Now they have ten. In Poland, the number of sanctioned Catholic exorcists has doubled in the past five years.
And that doesn't even count the unsanctioned practitioners or the evangelical version of the practice, called “deliverance”. In 1999, the Catholic Church revised the rites of exorcism for the first time since they were written in 1614, in order to accommodate modern demand.
One of the more interesting, and thorough, things I've read on the subject is the book American Exorcism by Michael Cuneo. You can find an excerpt of it here. In this example, he talks about a deliverance he witnesses. In the book he describes the many exorcisms he attended, including a graphic multi-day mass exorcism.
But the most interesting part of the book explores why we need, or think we need, exorcisms.
One important question is did media like The Exorcist expose us to the reality that we need this spiritual cleansing, or does it give us a convenient scapegoat for our personal fallacies? Does believing someone is possessed blind us to the possibility of personal failure? Or worse, a severe psychiatric need?
Or, perhaps these rationalizations are placed in our heads by our demons, in order to hide their evil deeds. You can't empirically prove it isn't necessary, because there is much anecdotal evidence that it does. But you can't prove it is, because we haven't built a machine to measure demon levels in people. It's a bizarre thing to think about.