I had served as a children and a youth pastor at a very large and popular conservative denomination before I came out of the closet and went a more progressive route.
With that said, I had seen horrible results that "Therapists" had done to children and teenagers at these gay camps. There are nothing short of Barbaric and often times utilize a Victorian Era style of Psychotherapy to pray the gay away.
However, as long as you have conservative parents or one who is gay feels it is a sin, these places will always exist.
The more effective approach (at least in Judaic -Christian countries) is to properly teach Biblical Interpretation because about 90% of all these Therapists who are under the "school of fixing gays" usually come from a conservative religious background where they interpreted scriptures based on what their pastors had told them without really looking into the exegetical approach for themselves.
You get me in a room with a Conservative believer and I can run laps around their "clobbering verses"