By Nicolas Martinez For LeBron James, who is worth over $1 billion, the $500,000 cash prize isn’t a very big incentive for him to go all-out for the in-season tournament. But as the Lakers star admitted on TNT this Thursday, preparation for the playoffs is the only reason he needs play with the ultimate intensity. “I think this moment is great to prepare for the postseason,” said James. “Early on you get a feel for it. Even the game we just hosted vs the Suns, it had that playoff atmosphere. So for a lot of guys that have either never been a part of the postseason or haven’t been in the third …