This happened today. So I know it's weird to quote myself, but I asked the ground driver that was choking me to death on the dock with his running truck why the hell was it running while he was in the warehouse. Looked a little embarrassed and sheepishly said" we have to pay for our starters." No bull. I almost started laughing in his face thinking of this old thread. Did it when he left. If I see him tomorrow I'll ask him who taught him that.
The ISP probably bills them for items that can wear-out more quickly if the driver abuses them, like starters, tires, brakes, etc. As dumb and unqualified as most Ground drivers seems to be, I can actually see some of them falling for this BS. Pretty soon, they're getting their pay docked for worn-out seats, steering wheel covers, brake pads etc. There is nothing to keep an unethical ISP from pulling a stunt like this, and little recourse for the driver except to quit.
The best way to cure this is for all of us to video these trucks running (without showing asset numbers), and start posting them up to YouTube. Better yet, hop-in, and drive it around the corner and see what happens. Sooner or later, someone is going to just drive one off, toss all the packages into a waiting vehicle, and then leave the Ground truck (still running) for the police to find.