kawainui wrote:
Casting equals not being hit on, in theory at least. Cloth gear can be easier to find with better stats. Better stats equals better damage or heals. Better damage equals profit.
This.
If you're being hit as a caster in a group, you've done something wrong. Also, Moonkin get a bonus to armor contribution from items so they can afford to wear cloth and still be less squishy than your average clothie, although that applies mostly to solo play. When it comes down to level 70 content, most of it involves grouping. Those groups will most often include tanks. Tanks soak the hits. Casters do not Proper use of an addon like Omen ensures this. Most AoE damage you'll take in a group is some form of magic, meaning that your armor value offers no protection. With that in mind, there are three cloth wearing caster classes with at least one dps tree and only one leather wearing class that does caster dps. It stands to reason that dps caster gear will be more abundant in cloth form. Unless you're a tank, there's never any harm in downranking your armor if it means increasing other more important stats.