Like skid said, nothing will work if the participant isn't into it.
That's why I have issues with court mandated rehabs scentances. It looks great on paper, but if they don't want it, then it's a waste of time and money.
As far as scaming and what works and what doesn't... Diffrent strokes for diffrent folks. My Dad did detox at a local nuthouse and then AA.
At first he was really with the AA thing, but then he became seriously disallisioned with it and stopped going. If for some reason, he ever started drinking again, I'm betting he'd have to do a diffrent program (well, presuming he survived drinking again) because the AA wouldn't work for him.
I will say I kind of wonder about the effectiveness of the fancy resort style places, though. Seems to me to be a lot of distractions for a place where people are trying to concentrate on rewiring their brains.