I know it doesn't cost the big rig, but it doesn't save them much either (only a nominal amount from reduced tail drag as they don't form a complete air bubble)

I know it doesn't cost the big rig, but it doesn't save them much either (only a nominal amount from reduced tail drag as they don't form a complete air bubble), so why should they allow someone to basically metal-hump their vehicle for marginal to no benefit? For example: If it saves you $0.50 for every 5 minutes you tail a big rig, should the drafter be paying $0.25 to the truck driver? I'm also talking about the electronic fleet, where it's controlled by computers in each vehicle. However there's also the mechanical fleet, where two (or more) vehicles actually latch on to each other, this would be great for electric cars and would also allow them to power-share. For example, 5 vehicles join together but only 2 keep their engines running but the power comes from all 5 vehicles' batteries equally.