It's easy enough for a team's fans to be energized in the postseason: The intensity of a playoff game is at a totally different level than it is during a typical regular-season contest.
However, a number of teams benefit from a playoff-type atmosphere in their home arenas pretty much every time that they step out onto the court. And others (like the Indiana Pacers), have found a way to impose their will upon their opponent at home while not being cheered on by 20,000 fans.
Winning at home is absolutely critical to success in professional sports.
Road trips take a toll on all athletes, and since every NBA team plays half of their schedule while living out of suitcases, it's important that they take care of business when they don't have to leave their own city. There's no secret why home teams win most of the time: Home-court advantage is often so powerful that it's enough to overcome a vast disparity in talent between two opponents.
(Note: Statistics and records are accurate as of Jan. 10)