I'm assuming that crafting classes will be able to obtain guild leves like the other classes and would pretty much require them to turn in a crafted item. Wouldn't that create a demand for the materials that would drive the prices extremely high? Or could you just buy the item needed in the AH or would the crafting result be an rare/ex item? There's some factors in this I can't fully wrap my mind around.
It would be cool if you needed to enlist the help of a gatherer of some sort to help you get the materials needed but if you can buy what's needed from the AH that seems really lame.