Wrong. Haste beats out mastery every single time in Gold CMs. All I do these days is sell Gold CMs all day due to 1 night clearing ToT, and my full haste set out performs our guild's main Elemental Shaman using a mastery setup every single time.
Side note: Bla bla I'm over on hit, but obviously my forging is changed when we do Gold CMs, but that is my set. A couple of my pieces are forged for use in my main Elemental or Restoration sets for main raid.
My armory:
http://us.battle.net/wow/en/characte...Newsh/advanced - Will log in my Gold CM set for you for a while
http://proraiders.com/ranks/index.ph...emental_Shaman - Kaoes is our main Elemental Shaman, so he isn't just bad for losing with Mastery vs Haste, Haste is very much better in Gold CMs.
Enjoy!