Terry,
I think you're lumping in the business of teaching people how to have mystical experiences with other similarly dubious experiences of visions, dreams, channeling etc. The latter typically convey secret and exclusionary information. I agree that power mongers use these to establish authority and a following. Just because some gurus have managed to hook a group of followers peddling the way to attain these experiences, doesn't mean that the experiences themselves are enslaving.
The message of many mystics (free from any of the businesses around it) is non sectarian and freeing from orthodoxy. Access to the reality beyond oneself is purportedly open to all so one doesn't need that dubious profit over there to get in touch with the divinity.
The perspectives and motivations of the mystical experiencer are generally socially laudable. They are often times more interested in doing things for others or for the environment. Contrast that with the leeching profits who dole out purported communiques from Jehoober.