If a person really believes that they have some kind of special gift, be it mediumship right down to palmistry and tealeaf reading, as long as they're not affecting others then they're entitled to that belief. As soon as they involve other people, whether or not they're willing to be gullible, then a line has been crossed. People can and do get hurt by this stuff - and not only the gullible ones.
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'