Overcast... I think it's also a matter of mana efficiency.
Let's say I'm a wizard. I have a limited mana pool. I can expend that mana in a group, nuking a single mob that the group pulled, and then sit on my ass and med during the next pull. Essentially useless to the group.
Or... I can go off on my own and expend that same amount of mana (more or less) on killing four mobs at once, all by myself. And I'll still spend the same time sitting on my butt medding up as I would in the group.
So on the one hand, I get a major XP hit for nuking in a group. And on the other hand, I get about eight times the XP by quad kiting (as opposed to group XP). All for the exact same mana and downtime costs.
See what I mean..? It's just more sensible for a wizzy to quad, if you're trying to level up and get some money.
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