The cost of the extra drive time would seem counter to that kind of thing vs just serving more drives. It takes next to nothing to e.g. show a business with more emphasis on Google Maps so cheap ads for emphasizing your business are palatable for customers to buy and Google to serve. I'd expect something more like that (recommended destinations, recommended side stops) where the showing the option and getting a decline has basically no impact to the operation but you still have a chance to get the bite anyways.