Brian39 [and before him, Stupendous Yappi] have it right. The danger in using games in hand is that everyone tends to expect to pick up all points from them and then they draw conclusions accordingly. As we have seen repeatedly, that tends to happen very rarely and you're just setting yourself up for failure and high needed results.
The better guide is to count on getting half those points, unless you have solid reasons to expect more/less. [Wishful thinking is not a valid reason.] If it turns out better, great - that's a bonus. You also never count on other teams helping you out; take care of your business first, don't rely on others to do what you can't.