The biggest reason for a goblin ring is to break charm without using encountering spellcast recovery. Furthermore, should it ever be implemented, instant clickies should refresh spell gems at this point on the timeline.
The second reason is that you should never have charm on the first slot if fighting casters. When caster mobs go oom, they start casting as they regen mana - the spell they usually cast upon mana regen ticks at this point is a form of dispel. Ideally, if fighting shaman npcs (enchanters too, but those are very rare), you want the top slot open for slows to dispel with a buffer of a few junk buffs between charm.
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