I agree with the gist of what you are saying, but there is a way to have a voluntary system that empowers all of humanity who wish to participate with no possibility of inflation.
What happens when all of the people who think like I do choose not to participate? Or when you find prices heading up (fluctuating (inflation)) anyway? Or, what if some of the people who don't participate find ways to make a good living--but that tends to undermine the voluntary system? Not through deception or fraud, of course.
What happens then?