Speeders don't gain much, but lose a lot.
Quick to pass you, they end up just ahead of you at the next red light. Their driving style is hard on their nerves, hard on gas mileage, hard on brakes, and hard on vehicle maintenance. At the end of a day, they saved 15 minutes to a half-hour over the time they would have spent driving at the speed limit. Add to this the risk of tickets or accidents, and they gain NOTHING. If they got onto the road when they should have, instaed of hitting the'snooze' button for an extra 15 minutes in bed, no speeding would be necessary.