I'd like to point out that amazon is making ginormous profits, meaning increasing wages and ensuring safe working conditions would hardly make a dent in amazons revenue.
> It seems like most of the times, the result is a higher price for the customer, at least when things go well.
Can you substantiate this claim?
With the vast majority of goods the price is set by the market, i.e. higher wages would indeed result in a smaller profit margin and not in a higher price.