Just try to remember that "diva" GM is volunteering to provide entertainment for no compensation other than having a good time themselves. If they make a request (that is entirely reasonable, in my opinion) and that request ensures they have fun too, and continue to volunteer to run games, then I'd do what I can to accommodate. Why wouldn't you? Are you such a "diva" coordinator that you only enjoy GMs who follow your idea of a good time?
Mystic, how big are the game days where you DM usually? In a really big game day the dm booting you means you play a different scenario. In a reasonably size group it probably means you have to play in another tier. In a smaller group it could mean you have to go home. (or well, you don't have to go home but you can't stay here)