Darren Brown (famous "mentalist" from tv-shows like Trick of the Mind) has made a few audiobooks about hypnotism and he makes it very clear that it's not real. Even though it's fake, there's still a fair amount of skill involved. The subjects are not stooges, but people who are tricked into thinking they really are hypnotised. Even before the "hypnotism", there's a rather involved process of picking suitable people from the audience, people who show signs of being susceptible to suggestion. He also went into some of the tricks he uses when putting them into the "trance", like altering the instructions he's giving the subject to match things he sees in their body language, for example: tricking them into tensing up, and then when he spots the person relaxing again telling the subject that their body suddenly feels lighter.
his and other "magicians" may not be real using thier tricks but hypnosis itself is. Just what they may be doing on stage may not be qualified actually as hypnosis