Side referees?

With all the talk about the new rule on white/blue gis from 2012, what about the already defined rule that matches must have three referees? I think this is a very good thing and would improved the matches and judging tremendously, but why isn't never being used? (despite the obvious issue of having to pay three times as many people)

From IBJJF ruleset:

OBS: According to Confederation Of Brazilian Jiu Jitsu regulations there will be 3 referees per ring. When a match is in action, the criteria’s are as.following.

1. The side referees have equal authority as the center referee. This
means all 3 referees can call points and advantages as well as punishments.
2. Awarding points and/or punishments will be based on two referees
against.one-“majority..rule”.
3. In the instance that the three referees are divided on a call, the
decision will fall in the center of the three calls. EX: The center referee
awards 3 points for guard pass, one of the side referees awards an advantage while the other side referee awards no points. The call we be advantage, because that is the decision between the two extremes. Phone Post