Answer:
He realizes that he was only able to keep playing because he made money for the team owners.
Step-by-step explanation:
Jackie Robinson’s autobiography "I Never Had It Made" details how Robinson became the first-ever black man, a descendent of a slave, to play in the Major Leagues. But despite his huge success, the journey wasn't full of roses but rather more of thorns.
In the given excerpt from the book, he mentioned how he got moral support from his own people while receiving racist and death threats from Whites. And despite Coach Rickey's insistence of his support in any circumstance, Robinson also knew that he is a businessman first. And this need to profit, to succeed in his "Noble Experiment" requires the successful integration of Robinson in the game or else he'll also be labeled a failure.
So, when Robinson stated that "Money is America's God, and business people can dig black power if it coincides with green power, so these fans were important to the success of [the experiment]", he realizes that his influence in bringing Black people to watch the game, thereby increasing the attendees and also influencing the profit of the game. This made him realize that he was able to play because of his influence, his ability to get more people to attend the game, and bring in more profit for the team owners.