Every quest, every zone
Worth it? I was having serious bad luck with RNG (before the rep requirement for JP gear was nerfed) and couldn't get gear from normals to drop and get me into heroics. So I finished the quests to get some 450 gear.
Plus, many of them unphase areas and unlock dailies (depending on the zone)
You won't make all that much gold until maybe Outland and beyond. And then it's all relative to what you spend it on.
The only real reasons to do it are to enjoy the lore, or to become loremaster.
As I leveled this character I did loremaster at the same time...doing Eastern Kingdoms, Kalimdor before the cataclysm.
EK and Kalim back then were not broken down into quests per zone but quests per continent. It was a real PAIN to find all the quests needed to get it done.
I was just thinking though that because I would eventually outlevel the game as to where I am up too, that it could possibly hold me back from getting level appropriate gear for my toon...which would really suck.
Meanwhile, the people hurrying to max level hit a wall and get bored. I still haven't run out of interesting new things to do, have more Spirits of Harmony than I'll ever need, and am sitting on a tidy pile of gold.
Side bonus for Pandaria: quests plus human rep bonus plus the Sha claw turn-in means I'm already Honored with the Shado-Pan, even though I won't unlock them for another few days.
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