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The issue though is that it's a rare drop from basically anywhere in Outland. You can sometimes find the recipe in the auction house but its very expensive. The other advantage is the Zap throttle Mote Extractor, combine this with mining and you can farm motes quicker. Motes = primal so that's big money. Nothing wrong with selling a Primal Fire for 25 - 30 gold just for 1. And at higher level a lot of recipes require primal. Last but not least is jewel crafting. I don't have any experience in this profession as of yet, but I have friends that use it. Jewel crafters can make necklaces and rings. Also gems for sockets. At higher level you can get armor from quest, dungeons, factions and pap that have a color socket. Example: Blue Socket. These gems add additional stat points or damage, etc. So Bold Blood Garnet gives you + 6 strength. From what I heard these different gems sell decently, as long as people are upgrading their gear that includes a socket then these gems will be of use. So I covered a lot here but just wanted to break it down.
Tip 6) Gather professions such as skinning, mining and herbalist all can earn money, even fishing can. Some people do not take these professions that match their crafting one, but that is ok. This is where you can help. Skinning covers leatherworking plus is used in other professions recipes. Mining one of the best because it covers jewel crafting, blacksmithing and engineering. And herbs for the people who don't farm them. The prices are different and sometimes changing, example: on my server thorium sells for more than fel iron but not more than adamantine bars. Either way though these professions will always be needed since they are probably higher demand than crafting, that's how it is on my server

Tip 7) If you have the bag space keep all the items you get during questing, even though greys are crappy and can't really be used half the time they sometimes sell for so many silver or a gold or two.
Tip 8) Sell yourself, ok not in a bad way. But if a newbie wants a run and is paying a large amount of gold you should take it, if the time is there for you too and if you know you can handle the instance. Low level instances are quick and most of the time can be done just with a 70 soloing. You could do this or don't forget to sell another service. That service being your crafting profession.
Tip 9) You can also solo instances just along to get silver, some green items and cloth usually. The green items can be sold on the auction house or disenchanted. I took my level 70 though a instance every night for my mage and stocked up then sold the low enchanting stuff she didn't need. It was nice money, she went from 4 gold to 72 in just two days or so.
Tip 10) Take some time and farm in areas where recipes are known to fall or large amounts of cloth. Once you hit Outlands and start questing its pretty easy to see where you should go for gold and where you shouldn't. Some mobs drop motes some do not. Humanoids and undead most of the time drop cloth. You can even kill animals and sell the meat because Outland cooking is important if you want stat/damage food or just your own food. There also is larger amounts of silver dropped, some rep can be gained depending on area and of course greens and recipes.