And another thing...

It's often said that there are more people alive on the planet today than have existed, in total, throughout human history.

Therefore there are more living people than ghosts. Since a person can be possessed by multiple ghosts simultaneously, it follows that relatively few people are possessed at any one time. Also, if we take the view that most dead people move on to somewhere else, Heaven, Valhalla, Gwynfyd or whatever you want to call it, then it follows that ghosts are in fact relatively rare. Particularly if most of those remaining with us are busy possessing the living just to get another beer.

So it comes as no surprise that few people meet real ghosts, and that most reported 'hauntings' are nothing more than misinterpretations of natural events. Often these are reported by simpletons, naturally, although sometimes they do involve people who should know better. Few ghostly events are real, so the real events are difficult to sort from the mistaken events.

Now, if we take the argument above, that 'loose' ghosts are rare, then it is likely that there are fewer ghosts than there are mediums to talk to them.

Therefore my original stance, one I have held for years, remains correct.

Most mediums are charlatans.