My theory is that he didn't see the ghost, but instead did the "exorcism" to entertain his daughter's (?) friends. He obviously had no ill intent, nor did he want money, so..
Thank christ the old dude was just a regular ol conman and not a creepy pedophile. I will admit, I may have been a little hasty in calling him a disgusting pedophile creep a little bit ago, but to be fair his introduction was straight outta an NTR hentai