What if that win you gave them prevented you from going to the playoffs?
I look at it this way, if there are rules they need to be followed. If it's not clearly defined and is questionable, I would probably give it to a lower skill level player but I wouldn't give it to a higher skill level player. They should no better.
Well, if we must....
We "could" break down every missed shot "could" eventually lead up to why my team didn't make the playoffs. Let alone a single game. Yes, you are right, that one game that I gave my opponent may be the difference between making the playoffs or not. Theoretically it is possible. One game out of my one match. My match will have anywhere between 2 games to 9 games. So we can break that down, too...
We can break down which week of the session it occurs in, as to how important it is to the impending playoffs. Yes, a loss in week 1 counts as much as a loss in week 15. But if my team isn't in the running to be in the playoffs in week 15, that would adjust the weight, would it not?
And of course, I'm not saying that I would necessarily give up the game every time. There are a couple individuals that I'm quite certain would not extend me the same courtesy, and I would treat them accordingly.
All of this is why I originally pointed out that there is a rule for a reason. And that different scenarios would affect the situation. You can apply the letter of the law in every scenario. You have the right to do so, after all, it's in the rules. However, in games between friends, especially in regular league nights, some folks might be a bit more lenient in absolute application of the rules.