[Master Shake]

I don't think it's sadistic, but it does have an effect on gameplay. If, once there are 6 Globals up, you always have to 'overcome' a global, even if it was dispeled, then the net result is that people have to put more and more gems into their globals.

In that case, there would be fewer and fewer global turn-over as the game progressed. If, on the other hand, once there were less than 6 Globals, a new one could be cast for the minimum gems, Globals would be changing very rapidly during the late game.