"one man, one vote" is certainly a principle of democracy.
but there is so much "vote buy" in poor population in many countries (Brasil, Thailand, India, Japan etc.).
In such case, "one vote" does not contain the real will of the voter.

Today, so many people are indifferent of the politic of the place they live.
People are rather interested in individual material enrichment.
In this way, they are slaves to the commerce whicn is more and more dominated by a handful big companies.

Don't you think it sad to see always the same industrial products in any place in the world?
I prefer to see regional diversities.
You know, we "vote" eveyday by "buy"ing.