It's not just the trophy, though. If it were, I'd agree with you. And the first couple RMC games I watched, it was like "oh hey, it's Colorado, there's a fan trophy here, neat." But starting with the shorts stuffing, and increasing every year, there has been real vitriol between the two teams and the two fan bases. It's now transcended hating Mastroeni, but I think others are correct in saying that he provided the spark that's been built upon since then. It's been helped along by playoff spots, cup wins, last-minute heroics, and fan competition (that unfortunately has occasionally devolved into stupidity on both sides, but no rivalry would be complete without a couple of assholes taking it too far). Is it on the level of Barca-Madrid or Celtic-Rangers or Man U-City? Of course not, but I don't think anyone but you has ever suggested that anybody thinks it is. But as MLS teams go, I and many other fans thoroughly despise the Rapids, their players, their fans, and their entire organization. That, by definition, is a rivalry, regardless of whatever trophy (or lack thereof) is at stake.