No, I haven't investigated with the TV people but I have investigated several "haunted" spots. I have talked to people that have gone with them. Yes, if you have the bucks you can hunt with them. What you see is a compilation of a weeks worth of investigation. When you see a "guest" hunter it may be someone that accompanied them, on that trip, that happened to catch something. Also, somewhere in the credits usually is a disclaimer that they have the right to recreate something that was not caught at the time.
Saturday night I was investigating with a group on the North side of Chicago. Only 2 things happened that I was a part of. One was an EVP. One of the investigators was eating a Rice Krispie Treat. I told what ever spirit that was present that if they were hungry, grab a bite of the Rice Krispie Treat. On the recording I hear a female voice say, "Ooooh, Rice Kirspies." The second thing that happened was with a mini-mag flashlight. It was my flashlight. I set it so it would a slight touch would turn it on and off. The entity was able to turn it on and off. Unfortunately, I didn't have my video camera running at the time. Will I say it was ghosts? No, I'll just say its something I can't explain right now.
Now to answer your question, "Are Ghost Hunters Fake?" In the beginning I would say the TAPS group was not faked. Now that it is a popular TV program, there may be some recreations but not totally fake. I find it interesting that in the beginning they debunked more than called "paranormal" or "haunted".
Now, Zak and company, IMO are full of $hit. Emphasis on the dollar sign. It seems like Zak is attacked by entities and demons on every program.
Ryan and company. I've read some stories that they have not presented their cases properly. Some of the people that his group has "help" came out and said they misrepresented some of the facts. I also believed they used ex TAPS members as paranormal victim that claimed no knowledge of the paranormal.