What percentage of people have over $1,000,000 worth of wealth? I've lived in NYC all my life and I would guess for most people their biggest source of wealth is nothing or their house, generally worth under a million.
Well, most people are serfs, and poor. I don't think you can define "rich" as a population proportion. In a lot of places in the world 100% of people are poor. I don't think it's unreasonable at all to say people with less than $4 million USD are poor. Anything less than that and you're probably still well stuck in the rat race. One catastrophe away from ruin.