@ehndras: that's what was done for the third and fourth invasions. The results were less than perfect. Not many people are willing to put up with the abuse the player base heaps out on GM players... 
I didn't like the Fourth Invasion, but that had relatively little to do with the GMs. I thought they did alright, all things considered. I actually quite enjoyed the Monster GM's RPs and thought he created some very interesting and memorable characters out of his NPCs - the Wisdom-Sword-Shield triangle was interesting to follow, and I quite enjoyed the overall clan dynamic with Epic and Justice as patriarch/matriarch, etc. The problems and frustrations I had with the Fourth were more structural I always thought.
