See, I say this is probably actively harmful anyway.
People who believe they need an exorcism might be suffering some legitimate--and often dangerous--mental illness. Schizophrenia, for example. Or serious depression. Or maybe an eating disorder. Or maybe they're gay. They're paying a huge amount of money for a 'fix' that isn't going to work and then, believing they're all better, they go and try and live their lives as normal again while whatever is wrong with them keeps getting worse. Eventually they might do something drastic or dangerous to themselves or someone else.
