You're not a sore loser. Your argument is legitimate.
Nevertheless, one of the core aspect of GAC is to give the advantage to those who have broader teams. The devs more than once said they see it as one of the keys (to success) in the latter part of the game. There are plenty places where more focus players got the advantage, and while it is also true here to some degree, in GAC there'a also importance to much wider spectrum of teams. Those who are more evenly spread their resources deserve something in this game which give them advantage.
And yet, there are more than 1 way to overcome rivals with higher gp. I for once, faced most of the time folks with higher gp (sometimes up to 600k more) and won more than I lost