Let me guess. You are still bitter about the Dodgers’s move to the west coast.....
Brooklyn was doomed when it became a borough of New York City. After that, it was subject to whims and vagaries of the city.
O’Malley was not losing money but the area around the stadium was changing character and he new it was a matter of time before people would no longer feel safe coming to the park. He wanted the city to build a new park and when city council balked he went West. He was following the Giants who had gotten a great deal from SF.