The exciting thing to me about watching NHL games is that NHL teams have a lot more parity between teams than any of the other major sports. Sometimes a Blue Jackets/Panthers game will be just as competitive as a Penguins/Capitals game.
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Probably because they're easier teams to beat and if I were to pay I'd rather see the Leafs play a team I always expect to beat (Sens come to mind) than the Bruins.