Many good points.
I love the secrecy of Mentalism and respect many of the established Mentalists' desire to keep it as such. It is what keeps this art pristine. It keeps the dilettantes away.
That said, I don't believe an open forum will immediately translate to overexposure of the art. We can talk about the development of characters, pacing of the show, presentation, etc...
Furthermore, isn't this what this site is for? To make better performers?
Being a student of psychology (and philosophy) myself, I have a lot of interest in Mentalism and am ready to dive right into it. With the resources and quality of staffs on this site, this place is perfect.
best,
Nash Fung