I used to sell glyphs and got really good at that, made quite a bit off that in cata. Then they nerfed glyphs and they dont sell at all. I am now selling the shoulder enchants; i tried to sell one card but it's not selling. It may be one of those things where you dump 10k in mats in and sell 1 thing and get profit. I tend to not like those markets because it's too variable and you can get stuck with worthless items.
I leveling my JC on another toon to 585 and started looking into that, the raw gems are almost selling for nothing and cut blue gems not much more. I'm doing decently with enchanting but typically that doesn't sell all that well.
What are people doing to make gold in Pandaria? It looks like with raw mats so ridiculously available any craft profession will have a hard time unless its epic items (until the next raid tier anyway).