I'm not convinced Amazon would suffer significantly if they raised their prices by 10% on average. No other seller can compete with them on convenience, and people are willing to pay for that.
I didn't say that consumers would choose to pay extra for decent employee treatment. I said that Amazon could just do it and get away with it. Mind you, I'm also not convinced that the cost of treating your employees like human beings is as high as 10%.
Also, for fuck's sake stop making excuses for abusive employers. Why would you do that?
So there you have it! Create your own "Amazon," 10% more expensive but we treat our employees better.