>>michae+(OP)
The average home today was a mansion a hundred years ago. They became average because we built more mansions. If a hundred years ago we had built low end housing we would all be living in low end housing today. The Soviets did exactly as you are suggesting and they figured out the hard way that building low end housing leads to people have low end homes.
"Mansion" is entirely subjective. Its just a way to refer to the nicest homes available.
Well-being is based on production and production is not a zero-sum game. We can have low-income people living in high-end housing. All we have to do is keep building nice homes.