It isn't really a matter of each individual person seeing something different.
It is more of a matter of each person's ability to see.

Each person has a range of vibrations they are able to perceive.
(and it may not be "seeing", it could be feeling, sensing, knowing, hearing)

There are pathways to get to a place where you can see.

It is more apropos to say it in this way.
I cannot prove that God exists, but i can show you the pathway that will allow you to meet God yourself.
However, not everyone goes down the path at the same rate, and many people give up halfway down the path.

On another note, there are three different manifestations that people lump together as "ghosts".
And each one is perceived by different means (different paths)

But i have known enough people that have gone down the path that all share a common perception of these manifestations. All of them "seeing" the same thing.

And when it comes to money via entertainment, there is no correlation between actual work involved, or actual help that is achieved and what money you get out of it.

On Steem, we had well thought out posts make 2¢ and pictures of a lady's vacation make $10,000