I don't understand why they allowed all of the players to be able to be all disciplines. It hurts the markets in my opinion and their "Bazaar concept" they had going. When people started players out they should have been only able to choose one discipline and stick to those jobs under that discipline so that there is that heavy reliance on crafters, gatherers, mages, as well as melee classes. I think the Market Wards would have been a ton easier to use for players that mine, craft, and farm. That would help players separate things to sell since they can only gather certain items due to their discipline.
I see most folks complaining about selling multiple types of items and others not being able to find it, as its being sold in the wrong ward. When I first started I chose gladiator. Since I needed gear, instead of looking for an armorer to make it I bought a hammer and made my own stuff. Its kind of sad in some degree.
I don't know... I wish Square-Enix built this game with a little thought of how players will avoid others to get what they need. I still love this game to death and will stick to the end. I just wish for stuff you know. =P