What makes Beethoven so wonderful is the sounds that come out of the silence he was surrounded in. it can pretty much be compared to the Beatles before and after drugs. much better after the composer has an awareness expanding experience.
Van Gogh does in fact work to express his illness and make people understand.
Vasili Kandinsky worked to portray his very strange condition called synesthesia.
Curt Cobain tried to let people look inside of him and see the darkness.
i'm afraid you have a very plain and simple (and oh so wrong) idea of what art is. what defines everything, from a baby's little hand to the ocean itself, both objects and ideas is not the stuff they are made of, but rather the space around them, more precisely the border between the "thing" and what is "not the thing". these borders are what defines everything, and this show explores exactly those borders. people are not defined by their disabilities, but that is a fact easily forgotten. so many disabled people would have liked to remind themselves of what those borders are really made of.
you can argue with the technical skill of the performers, but you can't argue with the message.
you would have liked to take the troupe and put on a show like any other show. well, this show ain't nothing like any other show. that's what it's all about.

Just one question: have you ever seen a show of people with Autism?
We're not arguing "what art is" here. I'm arguing against using people with sensory disabilities to make money, from which others (those who are using them( enjoy in the end - not those who really need the money and help .

an essential part of belonging to society is giving back to it. the Nalagaat people have managed to do that through their art. you are concerned about the fact that this is an extremely small group, and i share that concern with you. i think the group should deal with more people, hopefully, all of them. take for example Itzik, one of the performers. the man has an amazing inner world which can easily enable him to be a writer, literature critic, journalist and whatnot. is theater the best thing for him? i'm not sure. however, it's a start. he now knows he can (through hard work) do many things which are considered outside the scope of his abilities. i think the group should be less about theater, and more about giving these people the freedom to do whatever they choose. however, this is a start, limited by available resources. Adina's unbelievable hard work is in what she knows how to do, namely theater. As this is a start, it also needs some business sense (provided by Eran Gur) to enable it to survive, which is so not trivial. about the fact that other people need more basic things like food and shelter, i don't feel as this contradicts Maslowe's hierarchy of human needs, but rather complements it. from what i got from the show, the need to communicate and be heard is so acute to these people (which is taken for gratanted by us), that this lack of communication can even drive some of them to suicidal thoughts.
as for the "freak show" analogy, i have to admit that i understand how someone looking at the show through these eyes might percieve it as such. it is not a great performance of theater. the technique is sometimes similar to borderline "training" as you claim. still, i think it is not meant to be a display of theatrical skill (eventhough in Adina's mind it is), but rather a display of spiritual achievment, albeit technical in nature. in that sense, it can be compared to a master warrior from Shaolin, who through training (which looks from the outside as very technical) can achieve things way outside of human ability.