Most new Nets fans probably weren't even NJ Nets fans. There's a certain hometown pride that would make some people become a Brooklyn fan, whether they were born there, live there, used to live there, or work there. Then, you have some people who like the novelty of a new team. And there are others who like the name, Brooklyn. It's got a certain grittiness to it.
Whatever it is, who cares. How many Dallas Cowboys fans became a Cowboy fan just because of the cheerleaders? And then, later liked them for the players.