As an Ex-Breeder, myself, I think that a shift in one's sexuality is certainly possible. I can't honestly say that I was entirely pretending or hiding all those years. There WAS genuine attraction to the women that I dated and eventually married. But time and events brought a shift in things, and... This is where I am now, and I am OK with it (better than OK, in fact!). But I wasn't "recruited" to the gay world, as many Fundies would probably suggest- I found it all on my own, and had been curious about it ever since puberty. If there are any attempts at recruiting going on, it's all of the organizations and websites promoting "Ex-Gay" services and counseling. These folks clearly prey on gay people who are at odds with themselves, their families, their churches, etc...
I don't know anybody who was "healed" by such an organization, but I did know one man who became ex-gay. He had grown children when he came out, and he lived as a gay man for almost 10 years. And when I say lived, I mean he ***LIVED***, baby!!! Let's just say that he was a wild one that just immersed himself in all things gay and he seemed to be good with it. When his dad passed away, he began to change. He spent a LOT of time with his family (natural- after the death of your father) who were largely pretty religious. One day, out of the blue, he calls me to say that he couldn't live the gay life anymore. He was selling his house, quitting his job, and moving to the small town where his brother lived. When I pressed him for a reason, he just simply said that he now believed that it was "wrong" for him be gay. That was about it- he didn't try to convert me or say that I was on the road to hell or anything like that. He just hung up, and I haven't heard from him since. I hope he's well and happy with his new life. I'll never know whether or not he was "recruited" to the ex-gay fold, or whether it was a personal choice that he made all on his own, but I guess it doesn't matter too much.
So all this to say- I think there can be, and IS a presence of truly ex-gay people out there. But I don't pay much heed to the ones who are actively out there PROMOTING becoming ex-gay. Just like I can't convince a straight guy to come to the other side, neither can they convince me to come back to THEIR side- It's gotta come from within!