Look at this . Look at what those TV programmes are doing. And this.
The first starts out with 'We are looking for experienced investigators...', then continues through a description of the equipment provided, which includes 'meters to measure changes in frequency' (after editing out the swear words, my comment has no words left in it), motion detectors (oh, so very useful when the place is overrun with 'investigators'), thermometers (infrared no doubt. I hope they have insurance because those things have laser sighting beams) and 'devices to record EVP' (just say tape recorders, for %$*! sake!). You are encouraged to bring your own digital camera (why do they specify digital? It's the least useful kind) and night vision equipment (I guess so they can save on their lighting bill).
Right at the end you find it costs £99 per person. Naturally, you have to give back all that equipment, which means if you did record a voice, you can't keep it. There wouldn't be much point anyway. There'll be 24 of you on that little excursion. A recorded voice would be useless. You'll get orbs for sure, if you take a digital camera and have 24 people plus staff churning up dust. It's a night out on the modern equivalent of the fairground ghost train.
The second is worse. English Heritage, who look after historical buildings, have forgotten they don't actually own them and are cashing in on the popularity of the ghost hunt. All this is because of those programmes, the shows where everyone's a winner, every investigation gets a result. Just one night, and you can experience the wonders of the afterlife. Bollocks.
It's cashing in on the gullible, taking money from those who hope to contact the dead. It's exactly the same thing a stage psychic does, and it's just as deplorable.
Don't fall for it.
(okay, I'm laying off the caffiene now).