There used to be separate items for spell damage Aoc Gold and healing. A healer weapon had healing and DPS casters had spell damage. Earlier in the year, spell damage and healing stats were removed and a new stat known as spell power was introduced. This would affect both damage and healing spells. Because of the side effect of this, Mages, Warlocks and Priests found them competing against each other for certain pieces of gear. The end result means more gear being used and less gear being shard or vendor.