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Alchemy: Selling your transmute cool downs and creating various consumables, Alchemy gives you two ways to make 4story Gold. This is a decent profession to make profits.
Alchemy has the advantage of bring a fairly cheap crafting skill to do WOW leveling, though the perks are a bit weaker compared to some others in Lich King. Many of the potions are profitable, even at lower levels.
Blacksmithing: Blacksmithing is a good profession for WOW money sink. Even though, this is an expensive profession to do WOW power leveling and often the materials are worth more than the finished product, you should manage to gather all of the materials for a high end recipe, and it's at the cost of other activities that are more profitable.
If you buy the materials and manufacture your items, then you are engaging in speculation that could go either way.
Engineering: If you are a soloist, you can make good use of the goggles in Wrath of the Lich King. One item you can make a bit of WOW gold on is the Overcharged Capacitor, which is a recipe you get early and which is used in a quest in the Borean Tundra. It's also used in an Engineering specific quest.