Because the other team will underestimate a significantly lower rated teams gives lower rated teams a chance. Sometimes I feel it is too heavily weighted, however it can create a lot of drama!
There might be something to this. My team was struggling in our first year in GHL and on a 6-game losing streak (one of the losses being against a team that is 1-29, that being their only win) THEN all of a sudden I somehow beat the team that recently 3-peated as GHL champ and arguably best team in the game world.
I suppose I still wouldn't call this ridiculous as it happens in real life sometimes, just a very odd-timed win.