EXCEPTION: If you have Mining and only use Jewelcrafting to craft stone statues (for additional in-combat healing), then this may be a useful tradeskill. However, like Engineering above, it should not be a leveling focus and should only be used to assist with power leveling. Doing any more than this will become costly and should not be undertaken during the power-leveling process.
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Gold-making blog Just My Two Copper suggests that enchanting will be quite the money making profession during the initial phase of Patch 5.3. This is because with players racking up new shield heirloom items and new PvP weapons and cloaks, and the tendency of PvP fans to max out every potential stat in their gear to win their matches, they will spend a pretty penny on Enchanting boosts. Just My Two Copper expects direct enchanting fees as well as the costs of Enchanting materials to rise during the start of the patch.