Raising the wages of humans so they are the same cost as machines doesn't make the machines cheaper. Amazon could keep workers wages low and still buy machines and create the market. One doesn't necessitate the other.
And again, that is where you are wrong.
Economies of scale. Building one machine is expensive. Building 10 is slightly cheaper. Building a thousand lowers the price. A million makes them a commodity.
If the politicians and employees were not complaining they would not have raised wages.