The trouble with letting only "certain people" participate in plant rescues is that ONLY these "certain people" will end up going on plant rescues, and they most likely will keep all the plants for themselves. It's usually very clique-ish.
How do I know?
I used to belong to Wild Ones, and our chapter did many plant rescues. I was a fully paid member, and I was never invited. The "in" crowd was, however. The "in" crowd got themselves very nice native plant gardens, for free. Did they share these plants with other chapter members? Nope. Aprilh.