Oh yeah but you legitimately can get more work done. It's just every now and again it causes a trucker to plow through a schoolbus because they're half awake at the wheel. This is why Truckers are hired as independant contractors to limit the liability of companies making them work unsafely. So they can argue they don't need to pay for little Billy's wheelchair.

Yet for the companies involved this arrangement is highly profitable. They don't pay any of the externalities. I'm not saying it's a good thing. It's merely a profitable thing.