No it doesnt cancel out! Because on the rainy day you make your move from 10th to 9th and you score 1 point. On the good day you make your move from 2nd to 1st and you score 5 points..enough for FIVE rainy days. so you make the move. Are you being deliberatly awkward with this?
How can you not understand this? If the driver doesn't need to make those 5 moves, that robs us of 5 overtakes. As such, the one move for the win in that earlier race (And by the way I really don't think that in most situations drivers needed any more motivation to go for the win - and once again, they did not receive any extra reward for moving from 2nd-1st) means the driver doesn't have to make those 5 moves later. That cancels out the point of incentivising them for going for glory, since they can just afford to be conservative. You're not encouraging drivers to go for glory more often, you're just shuffling the numbers around.
I'm with racechick on this one, but any revision to the points system is always going to have sceptics and critisisms, but I do not agree with what your saying here Jensonb. Drivers will always push for the bigger prize. The bigger the carrot (in this case, the points for the top spots), the more they will push for it, its that black & white in my opinion. Just because the size difference between the 2nd & 3rd place Carrot is the same as the size difference in the 1st & 2nd place Carrot means nothing, the 1st place Carrot is still the biggest of the lot.
Coming onto the original question here (lets not go too far off track), Point for fastest lap is a good idea (they had it in the 50's), as currently the fastest lap is just a consequential bonus, it doesn't earn the driver anything (except maybe a bragging right). Having a point for fastest lap means that it actually rewards the driver that earns it.