My Dad and I have discussed this for a while and neither of us can understand a logical reason (other than the cost) for adding a fourth official to every game.  While this may dilute the talent of the officials in the league by adding more, it greatly reduces their responsibilities and pressure to make a call they are not sure about.  How often do we see an official make or miss a call that there is no way they could have seen from their position on the court.  The cost of the addition of a fourth ref would be quite minimal compared to the salaries of the players or even the increased revenue by producing a better officiated game. 

Well what do you guys think?  I am wishing for someone to explain why they haven't done this as there have been so many official conspiracy theories and criticism within the last five years.