Already playing public quests and they are not the same thing. They are fun mind you but they are not a real raid. Not to mention that the pqs mainly benifit the people doing the most dps with loot so the healers are always screwed.

A week is not enough time, and you would never know what week you could get in, scheduling would be a bitch for big raids.

Also now that wow has opened up its raids to everyone its alot less boringing. Do Black temple one week then switch to Mount Hyjal or goto SSC or ZA. By time you get back to one you were bored with its not as boring then.