It’s not just a skeptical question. Plenty of people ask me why they’ve never seen a real ghost on TV. They want to know if ghost hunting TV shows ever found real evidence of ghosts.
TV shows — and paranormal researchers, in general — don’t find real evidence of ghosts because, so far, there is none.
We’ve found nothing convincing that we can show others. Skeptics like the (not so) “Amazing Randi” will always find flaws, shortcomings, or weaknesses in the recordings of all kinds.
Investigators can show that something odd is going on.
By process of elimination, and with an open-minded witness on the scene, they can show that it had no obvious (normal) cause.
Despite that, no one can prove a ghost caused whatever happened.
Shows such as the Ghost Hunters franchise and Ghost Lab have impressed me. They’ve shown the world fresh, effective research techniques and tools.
However, that’s not scientific (“real”) evidence of ghosts.
For now, I doubt that anyone will produce scientific evidence on ghost-related TV shows… or in real life.
I hope I’m wrong, but I haven’t seen the progress I’d hoped for.