Performance vs. Photography

While reading this article, it seemed relatively comparative to the last blog I posted talking about "performing the moment." In fact, the artist I talked about in that post had been stated once more in this new article. (Chris Burden) All these accusations against the camera capturing the action of a happening all come down to one point, the viewers reaction. Isn't that what an artist is aiming for anyways? He wants to achieve a certain revelation from his viewer or explore the reaction he receives from them during their happening.
While sure, I COMPLETELY agree that looking at documentation of a happening is nowhere near the same as the impact that viewing one in person would be, however that is not to say that their is no impact. In order to explore this idea, I went to do a little experiment of my own, since we were required to review one of the artists anyways, I searched for Stelarc's meat hook experiment. The result is probably the same as the one I would have if I was viewing the action in person, I really want to vomit. However it is quite possible that if I was there in person witnessing him hanging by hooks piercing his skin I might just have vomited because I can't stand the site of body mutilation. While looking through Stelarc's "official" website, it seemed that most of his experiments were designed to test the body and its capabilities. I'm not sure if this means he was able to hang himself comfortably but to be able to hang in a cross-legged position doesn't seem like it should be all too stressful.
All this argument brings up is more questions about photography versus live performance. Does the existence of a camera ACTUALLY influence the viewers perception of whats going on in front of them? What if they don't know the cameras there? Does the artist have to repeat the performance in order to show it to more viewers? If so, is it still achieving the same effect the second time around? If pictures don't do justice to the performance, what is to be said about the reaction it does create for its viewers? I feel as if the existence of photography needs to just be accepted however acknowledged that it is not and will never be the same as viewing something in real life. Just as movies are different from plays and reality, there all have different ways of achieving the reactions they desire.