Ok, now that we've got you over you're duping fantasies, here's a couple tricks to get money fast. I can only speak from a skinner's view, as I am a skinner/leatherworker, for other professions I am sorry.
1. Hunt Humanoids that can be skinned.. Why? They drop coin, they drop silk/mageweave/runecloth IN ADDITION to being able to be skinned, this is maximum money... How to find these mobs? Try thottbot. Get the correct humanoid mob that can be skinned for your level.
2. Max out Cooking as high as you can get it for your level and money you have. Why? Many items dropped by normal beasts(if no humanoid skinned mobs are available) are meat items... Livers, ribs, meat, etc. These can be cooked with Cooking and double or even TRIPLE the worth of them.
3. Clear out you're entire inventory before hunting - Find a good grind spot, and park a trade mule at the AH... This way you never have to leave your spot. You just send everything you want AH'd to your trademule whose logged right infront of the AH.
4. Find people who will buy items from you cheap, but at a stable rate, and will ALWAYS take your CoD's... Example : Someone I know buys my Thick Leathers for 60s per stack through CoD, they may go for 70s-1g at the AH. But effeciency above all, I can send my stacks to him whenever I want anytime and he buys them... Insta-Money. Insta-Space. No time wasted.