Loading down our system with low profit packages increases pressure on the company to get more done faster with fewer people. There is an optimum level of Amazon we should take for the price we charge, and my guess is we are taking way over that optimum.
Following the law of diminishing returns, if we don't scale back their volume or increase their rates, the company won't have the workforce to deal with the volume, because everyone will be injured, quit, or massively slow down their performance, eating in to profit. We already know the company doesn't like to invest in maintaining equipment, even at current profit levels, if profits drop due to staffing issues, equipment will start failing, and there won't be much of a company left.