There's a creative process to being a stage hypnotist. Part of the job is creating content that will entertain your audience and set you apart from other stage hypnotists. How do you do that?
Hypnotizing people requires one set of skills. Creating a stage show that is entertaining requires an additional set of skills. Most stage hypnosis trainers teach you to hypnotize people, and they touch every so briefly on the the business aspects and entertainment aspects of the business. They will often leave you to fend for yourself, in those areas. It's a big part of why so many people who have been trained and certified in stage hypnotism aren't actually out there doing shows.