Clog Iron said:" I don't consider that as a minor performer within a large group I've somehow become public property."
If you are performing in a public place, as part of a performance for the general public, then you cede you right to privacy. The general public would have the right to photograph you, even if they sell the photos. They are in their rights as long as the picture taking isn't disruptive and thephotos aren't used in some slanderous, or dishonest way.
In a private venue, this isn't as clear. The folks running a private venue can have a policy to restrict photography, sound recordings, etc..
On the other hand, asking permission is the best course. If a performer asks to not be photographed or recorded, I would respect that.
Pro phoyographers frequently cover themselves by obtaining a model release even when shooting is not restricted.