I expect everyone in a raid to have a full stack of Overclocked Manastones, plus some power potions and there are sigils from the City Vendors that replace power. Lots of mobs suck power in huge amounts, and raiding in BoL they like to do this over and over and over. Every little bit of power regen you get helps. You are using good drink, aren't you? I mean player-crafted drink that's either your tier or higher, the kind with stats. Drink refills your mana.
Sometimes. I ran raids for Legends of the Tundra on the Lucan d'Lere server for several years. Right now I'm mostly playing my raid warlock.
Being a guild leader is like suddenly being everyone's mom, psychologist, marriage counselor, and only friend. Raid leading is easier than herding cats, but there are some similarities. You have to expect that no one in your raid will ever be a ninja enough to avoid pulling that add, someone will click the clickie thing nobody is supposed to touch, and you will never have the perfect roster.