You could ask the same question, why are the kings/emperors/despots and their rich oligarch friends of any given country XYZ wealthy and living luxurious lavish lives in palaces and private yachts etc while the common folks live in slums?
You could ask the same question, why are the kings/emperors/despots and their rich oligarch friends of any given country XYZ wealthy and living luxurious lavish lives in palaces and private yachts etc while the common folks live in slums?