Are you sure you didn't mis-queue something and actually nuke? I've never once gotten XP for a cure. (and I always am grouped, at least with my husband)
I double checked. I cast a AE Cure outside of combat.
Note: Just to add a further note, I only saw XP awarded once out of 12 casts. If they do grant XP for Cures, it's sure a piss-poor compared to other Conjurer actions. Edited, Sep 7th 2010 6:53pm by rubina