My presumption is that crafting should be able to be done via recipe/item drops (eventually, at least). Store purchases should probably only wind up being used if you really need a single component and don;t want to go through the hassle fo farming it.

Of course, with everything being new and the "gotta have it right now!" mentality in overdrive, we really don't have an idea yet how long farming for stuff will take or even how valuable it will all be.

As for me, I don't plan on spending any platinum for crafting. If I can't get it "in game", I don't want it. I'll save my plat for unlocking game features rather than buying loot (including crafting loot).