This is what annoys me, people who make money from others peoples nievity. And this is what makes alot of people sceptic.
I dont doubt the that there is things that cant be explained by our current science, in fact I have a fair amount of experience in dealing with people or animals who are no longer with us in the physical, but those are my experiences, I would never try to make money from it.
Mainly what I have come across has been, more or less like a moment in time, which (usually) due to the extreme emotional circumstances, has left an imprint of sorts. Its like a video on loop, scary at times but completely harmless, most cases where harm is caused here its due to the person exerperiencing it over reacting.
The real scary ones are entities that have never been human, formed purely by negative energy (very rare cases positive energy) having no ties to the physical, and only raw, maliceous intentions they are not to pleasant.
When the large european ships starting arriving in ameria, the natives could no see the ship itself, only the people and the effect it had on the surrounding water. The idea of something so massive compiled of many different materials had never entered their minds. We dont see with our eyes we see with our brains, the brain sorts through all the infomation and only shows us what we are used to experiencing. Those early native americans we experiencing exactly that. Once they opened their minds to the new technology, once they stopped restrictingtheir vision, the ships became visable.
This is why some people experience things where others dont. Then there the huge amount of pranksters and hoaxes out there.