Why do so-called "ghost hunters" use equipment not designed for their hobby

They use things like EMF detectors, K2 meters, infrared cameras and the like. None of these things were made to detect ghosts, yet these hobbyists insist on using them because "supposedly" ghosts give off electromagnetic energy, etc.

But if ghosts are the spirits of the deceased, why would they still give off energy that living people do? How can a "spirit" even give off a heat signature? Given that parapsychology is a pseudoscience to begin with, you'd think the followers would be smart enough to not waste their money on such devices.

you dont need fancy equipment to do ghost hunting. sadly though people think that cos you have the fancy equipment it makes you "Professional" which is a load of crock.

the only equipment i use is a voice recorder (which is on my phone), my digital camera, and my most useful pieces of equipment - my eyes, ears and brain.

i believe in the paranormal (hell yeah ive had too many personal experiences), but tv shows and movies make a new breed of investigator that believes you need all the fancy equipment, and that every unexplained thing is paranormal. if a spirit wants you to know its there, it will show itself. you dont need fancy equipment to see or hear them.

most "evidence" that has been found can easily be debunked but people dont bother spending the time investigating and debunking possible causes. too many people suffer from paranormal blindness.

Because energy cannot be created or destroyed. Energy that your body had doesn't just disappear when you die as energy can not be destroyed.