I think the point of that quote was to show you how little even skilled warehouse workers can expect to make.
The more I read about the proliferation of temps in the US the more depressed I become. I know someone who works as a "permanent temp." There is no end date to her assignment, and she works 40 hour weeks year-round, but she will never be hired as the company (an Ivy League university) doesn't want to be responsible for her benefits. She has a Master's degree and does highly skilled work for them, I can't imagine how tough it is for temps on the other end of the educational scale.
It's an entire ecosystem of "disposable" workers.