I may not have a perfect definition of GP, but it certainly isn't WAAC. I cannot envision a situation where all six teams would agree to hurt one's standings -- including the one whose standings are hurt -- and I'm not particularly interested in hypothetical situations that will never happen.
The fact of the matter is that the only reason to throw a game is to gain advantage at the expense of someone else. While one tries to win games for the same reason, trying to win games doesn't bring up issues of pride, honor, and integrity.
Edit: Alas it is bed time, and I shall not become this fellow
http://xkcd.com/386/