The current system where the seller discloses the offering price will not work in a stagnant economy, or whenever an item's supply exceeds demand. In a stagnant state like what we are in now, undercutting is too fierce, and is easy to do since you know how much your opposition is selling. It keeps driving prices down until there's no more incentive for sellers to produce that item.
A few nights ago I was trying to sell one stack of woolen cloth, there were 2 other suppliers, so I did what anyone would naturally do I undercut by a tiny margin. Turns out one of the other guys was actively watching and undercut me. Within 4 hrs or so, we volleyed back and forth 3 times each until I gave up and went to bed.
Some might say hey this is just a natural way for the market to find its equilibrium, but as a crafter I think this system favors the buyers too much. Now please give the following points some thought:
1) Say you have 7-8 crafters providing a single item where there are more sellers than buyers. Some of them are bound to be impatient sellers, they will keep undercutting and kill everyone's profit. With open descending prices, the price will fluctuate so much overnight.
2) So some crafters will lose out, what's going to happen to the items in their inventory, stuff will keep building up going unsold? Raw materials are so abundant via mob drops and leves, and gotta go somewhere and get processed, therefore supply of items are going to stay high no matter what.
3) In the future, there will be a short spike where weapons & armors will be in demand when 2.0 goes live. But when that wave of players cap their crafts too, the same old problem will happen again, excess supply blah blah blah...
This whole stagnation is caused by open descending offering prices. The ward system benefits the most recent supplier solely, it makes the economy really volatile, unfair and it shouldn't be that way. The classic auction house with closed prices should be brought back (I know it's still being considered for 2.0) to completely replace market wards.
-OR-
Alternatively, increase the prices for selling items to NPC's so crafters have a way out.
Sorry for the wall o' text, hopefully the developers will deal with this looming problem.