i dont know how long this will last though seems like a fad like atkins. personally i do believe in the system they present and i came to that point long before any of this mainly because i started lookng into some new age practises. of which an ancient karmaic tradition stressed this kind of system whereby we can influence our lives for the better simply by visualizing and believing in it.
but what i think is that those who pay into this are either bored or seeking to fill some void in their lives. the system is not a temporary thing its a lifelong process... consider sucessfull execs, athletes and entrpeneurs, im certain they deep down had a desire to get where they were and they probably thought that way for years and worked hard at it. simply put they didnt jus read a book or attend a seminar and had an epiphany... for them it was probably a way of life and way of thought.
they might not consciously affirm it but i know thats how all the successul think. never underestimate what the mind can materialize.