Does being aware of the placebo affect in any aspect of metaphysics change your views and beliefs on them? If instead your mind creates the reality for you, do you view things differently rather than simply believing that it is an objective reality? I would list examples, except I'm not sure how much knowing about them myself has really helped me.
I hope I made this clear..
In magic nearly every spell or ritual is a placebo. It works in the same way as placebo in medicine - stimulates subconsciousness to do some action(I prefer to stimulate subconsciousness directly).