Using existing crafting I will show how the markets don't work. Particularly the inter-dependencies squenix was hoping for (and maybe illustrate why the crafting system needed simplification).
Example:
I am a BSM only. I want to make a new bronze hammer for myself and maybe some other new BSMs. I can make the nuggets and the hammer head myself, but I can't make cotton cloth or the walnut hammer grip.
So I go to the uh'dal wards and I can get the cotton for cheap enough but as it turns out, no one is selling the hammer grips I need. So I try to put in a WTB order with my retainer. Turns out if I want to buy a hammer grip, I need one first.
/facepalm
So after much begging and pleading, I finally get someone to make me my first hammer grip so at least I can put in a proper order for my retainer. And I do so. And it only lets me ask for one hammer grip at a time... because I only have one.
/double facepalm (retainer facepalms as well)
So, I put my one item up for sale hoping someone would sell me one so I can have two. And then I just realize something. Item search only works for things people are selling. It doesn't work for buy orders. And I put my retainer in a crowded spot. So for him to buy something, first someone has to find him in the crowd. Then he is going to have to browse the retainer's inventory. And that someone then has to have the ability, items, and desire to make the hammer grip. Plus I have to be offering the right amount because since no one is selling them and I'm not a carpenter, I really don't know how much they are worth or what a fair price is.
So if all that works out (retainer being randomly found in a crowd, by someone who will make the item) I've got to go through that process 3-4 more times because I can only buy as many grips as I have in my inventory.
And that's only a simple, early level item.
/triple facepalm (my path companion is now facepalming)
At this point two weeks have gone by, no one has sold me any new hammer grips, and I say "screw crafting, I'm going to fight stuff" never looking back.