Even the most severe stutterer is often totally fluent when he talks to himselfs or reads in unison with someone. That doesn't have to mean you experience a mental block when talking to others. A more likely reason is that talking to yourself isn't a real form of a communication. The demand on your speech system is so low that your stuttering threshold activated. I don't know if the therapy works. I'm unable to find any legit testimonials for the program. I would be wary if I were you to spend that much money on a program that might be a scam. Is an intensive course like the McGuire Program not an option? That one has helped many people around the world.