Almost Nobody likes to Heal
Everybody wants to be a damage dealer, whether they're a warrior, rogue, warlock, hunter, elemental shaman, feral druid, and even shadow priest; not many people want to sit back and heal. Every class that has healing capability doesn't want the responsibility of tossing first aid spells to people on the front line. Most anybody who plays this game wants to be doing the most dps.
It amazes me when shaman, and even priests who deliberately spec shadow for raid content refuse to give a healing spell. And every last one of them are apalled that they would have to do anything but deal damage.
Perhaps Blizzard can arrange ways for people to be able to purchase NPCs to heal for them in groups, raids, and pvp.
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