I got my first one to add on skype and he asked me how much he would make out of 1k gold. So just to prove this is a good way, 1k is not much at all and you will benefit more the more you spend, and dont forgett if you spend 1k gold you will get 1k back + more so next load you can use more, and its just continue untill you have reach what amount you want. You can ofcourse start on 100g or any amount you like, but i recommend to start with 3k to save alot of time

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-Start [01:05am], spent 1k on AH
-[01:08] Taking materials out of mailbox
-[01:10] start to craft
-[01:25] Selling to vendor
Gold earned 1350g to vendor
Bonus material worth on AH 432g
= Earned 782g
Thats 782g/20min, thats 2346g/hour.
This started with 1k gold, that menas you will now have 1350g in bag on just 20min and 432g worth in mats on AH. I spent around 3min buying material and taking them out from ah and sell to vendor at end, rest of the 17min i watched TV, took a cig and just waited. It could be even faster togheter with bot, addons that decrease the time it takes.
You can also use the bonus materials wich you wont sell to vendor to craft things, togheter with a good profile wich i tells about in guide you can earn alot.
Please add me on skype for any questions, this was a fast way to prove how good it is to one who asked me. If you start of with 3k gold i belive you will earn more then 2346g/hour since you have bigger chanse for proccs, and you use more time for it = you get more.