This is going to sound cold but I don't think WGT should compensate anything after 7/07. WGTNiblick posted about this issue on 7/06 and WGTIcon posted here about it on 7/07. Those of you who continued to play the tourney did so with your wide open, knowing the cost in balls to play.
WGT should have made an immediate announcement in the tournament section of the forums but the company's lack of communication in any meaningful manner is becoming legendary. Nevertheless, the issue was fairly quickly discovered and was being discussed.
So, since the end of the first week of July, it should be considered you played at your own risk and knew the expense involved. WGT acknowledged the problem but never promised compensation.