I don't buy the economy argument. Courtesy doesn't cost anything! I think people are just self centered and anything that might take them out of their routine causes stress. Are we that fragile?
Today, on our descent off the mountain, we were riding in a tight group of 3 near the 45mph speed limit. The car and 2 motorcycles behind us were distraught. Would they have felt the same if they were behind a car doing 40-45 in a 45mph limit? I doubt that. The car passed us illegally across the double yellow and the motorcycles passed us in the lane but inches away from us. Would they like it if a car passed them in the lane that close? Of course they had to rev their straight pipe exhausts too as they went by. Get a grip!
I wish my ranger friend was at the office when we rode by a few seconds later. I bet she would have invited them to a prayer meeting. LOL.