Ghost hunting is something most people do for free.  There is no real money in ghost hunting.  If you become a parapsychologist, then perhaps you will be able to make a living by writing books, but not through the ghost hunting activities itself.  Or perhaps, through experiences, you may be able to write a book or two yourself, without the parapsychologist degree, and earn a decent living from that.  I know of no job that will pay you for searching for ghosts or aliens.

When one considers the latest statistics, that 53% of the people in the United States believes in ghosts, you would think there would be more interest in proving they exist.  However, proving something like this is extremely difficult.  And no amount of proof will ever satisfy the scientific community because the evidence will never be solid, pick-up, examine type of evidence.  None-the-less it does not make it any less true.