Sorry Zodiac, you are wrong.
NBL Rules and Regulations (as at 1 July 2011)
61. NBL Ladder
61.1. Placings on the NBL Ladder during the Season
61.1.1. The positions on the ladder during the regular season shall be determined by the ratio of games won over games played.
61.1.2. Should two or more teams be tied with the same winning percentage during the regular season they shall be ranked by the number produced by dividing total points scored against into total points scored for.
61.2. Final Placings at the End of the Home-and-Away Season
61.2.1. Positions on the ladder will be determined by the ratio of games won over games played.
61.2.2. Should two or more teams be tied on game winning percentage at the conclusion of the home and away fixture, final placings shall be determined by the win/loss ratio in only those games played between the tied teams.
61.2.3. Should there still remain a tie; rankings shall be determined by the difference between the total points scored for and against each team in only those games played between the tied teams.
61.2.4. If teams still remain tied, rankings shall be determined by the points for over the points against percentages for the entire season.