The content originally appeared on: CNN New York (CNN Business)LeBron James is a billionaire, marking the first time an active NBA player has achieved that milestone, according to one calculation. Forbes said that the Los Angeles Lakers star has 'maximized his business,' generating more than $1.2 billion in pretax earnings. His NBA salary from three different teams during the past 19 years has amounted to $383 million, and James has 'raked in upwards of $900 million in income from endorsements […]