You're forgetting that one driver can only drive 70 hours a week (with rules around breaks in the middle), while presumably the AI could run the truck much closer to 24/7. In this case, installing a $200k system would allow the company to replace ~3 drivers with no interruptions in service.
More valuable than replacing three drivers is the fact that because the AI can drive all of the time the total time to deliver goods goes down which means it is more valuable and a higher price can be charged for the delivery.
