First I am a tagahanga of these shows even though as you read this you will tanong that.
They spend a great deal of money and are called sa pamamagitan ng some experts but they use highly questionable methods in almost every case.
First they tell the investigators what to expect. You never do that if you want to verify something, you allow everyone to find what they do then compare to see if they match. This way you get accurate information and i would guess a lot less of the: "Did you see that?" When there is no way for us to see because the camera is always in the wrong place. There are cameras like those used...