How is it grief when it was a) what you were doing for many months previous and b) was something openly discussed and dismissed. Lets not forget that GM didn't say what you were doing was grief and didn't change the mechanics of the game (other than a price increase for doing it).
You benefited from this, as it took a while for you lot to get your act together and take the walls from us, and allowed you to continue to war us and no show...
Please make rational arguments and, again, please remember that it is not the gameplayers place to 'punish' or otherwise sanction other players. It is the GM's.
Personally, I would rather GM devote himself to a kick arse, 10th anniversary Easter event, but I am sure you an your ilk will be happy causing as much grief as you can, event or no event. Always happy to cut your noses off to spite your face, eh?