David
I am fed-up of racing people who deliberately sacrifice their 2nd car to guarantee that their 1st car wins the race. You should be aiming to do the best that you can do (i.e. a 1-2); but because of how the points system works, you can deliberately screw over your 2nd car, finish 1-4, and score more points than the other player who was racing normally. It just feels so dirty and cheap.
Team orders... Something that is often employed in real life. Sometimes it makes sense to sacrifice one of the cars to achieve the win. A 1-4 = 37 points, a 1-5 = 35 and even a 1-6 = 33 which is the same as a 2-3 but the win is better because the lead driver bags an extra 7 points for the driver's title.
Not only does it improve your own points haul, as a bonus it also takes at least 7 points away from your competitor. IMHO it's a legitimate strategy and one which I am happy to use if the opportunity arises.