I think a lot of people must go exploring on lsd, I agree with HughieD, if you're someone who's mind is expecting bumps in the night to be ghosts then yes you will find what you believe to be ghosts.
However for everyone else who understands that the lead has been nicked from the roof, holes are rotting their way in and airflow moves things, water drips on things, wood expands and contracts at different rates, there may be another hidden explorer taking a shit, letting out groans as well as smells and there is always a rational explanation.
It's my personal feeling that ghost hunting does not go hand in hand with what we do, it's pseudoscience bs, and let's face it "we found DEAD LADY in black banging EERIE doors at us in SPOOKY ASYLUM!!!
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" is a much better click bait video on Goontube than the reality which would be "explored an asylum on a windy day and acted like a bunch of pre teen kids"