Because nobody's ever identified any game outside of Round 18 that year which we somehow should've won and didn't?
They're being far too generous.
Well, against Gold Coast, but there is a case that the team that beats Melbourne the best is Melbourne.
Im just quoting the current odds off here
http://www.way2bet.com.au/sportsbet...e-v-Gold-Coast/Head-To-Head/21653/22958/50437
Depending on your bookie, they are quoting GC at between 5-2 and 3-1 - in short, it'd be an upset, but not that much of one.