I checked the price of leather on the AH and it was dirt cheap. The price normally sits 50 silver each or more recently. When I checked today, I saw it at 30 silver each on up. I picked up every piece under 46 silver. 1164 pieces of it or 58 stacks. I converted it to heavy and got 194 Heavy leather. I paid 464G for all of it, so it works out to 40 silver a piece or 2.4g per heavy leather.
I also paid 146G for 40 eternal shadow so that makes it 3.65g each. More than I need at the moment, but I will use them eventualy and the price was right.
So my favorite thing to make are dream shards. At these prices I can make one for 11.44g. I am selling them on the ah for 19g each. So that is 7.4g profit on each one I sell. That is 60% profit.
Heavy Borean Armor Kit takes 10g worth of leather and sells for over 30g. I see it listed at 39g today, but with that much mark up it will not stay that high.
So if I only made Dream Shards, I should be able to get 48 of them out of this batch for a total cost of 550. As Dream Shards, I should be able to sell them for 912G.
If I only made the armor kits, the sales should be 1440g or more. I do a healthy mix of both. I can move the shards in greater volume and I know that market better.