Only because you don't realize how true it is.
Can you imagine Branduil if the Mavericks won a ring? It would change his whole personality. He'd look at life differently. How about Rodeo? After all these years of shit, and the failure of the Garnett years? Dude would flip a shit. He'd reminisce about it for the rest of his life.
Laker "fans" can't even remember highlights from their own championships. When they win, they think about the next one immediately. Its like "Haha yea! Thats 5 for Mamba! Two more and he passes MJ! Sweet!" Its a completely different degree of fandom.