At the moment, the mid-level crafters are creating a fairly small supply to meet the high demand for gear for the teens and early twenties. Gear in those ranges tends to be pretty costly since almost everyone needs it but only a few can make it, or make the harder parts necessary for it.
But how will the market shift over time? Lets not go into auction house or bazaar change discussion, let's assume that some sort of reasonable market system is in place so things are findable by people who need them.
Moving forward we'll have our first waves of people with one or two crafts at or near the caps, gatherers at the caps able to get the materials and players with War/Magic jobs at the caps. What will the distribution of demand be? If you've gotten Carpentry to 50, for example, what will you be making? HQ gear for lowbies and other people who reached the cap with a job but are trying out something new?
People level at all different paces and this game rewards switching around so the level distribution stands to be rather a bit wider, I imagine, but will there always be people around making Bronze Hatchet Heads for profit, or will we run into a point where these parts are "below" the crafters enough that no one really wants to make them except as a special order?
On the other hand, gear doesn't wear out or bind in this game that I'm aware of, so there may be Bronze Hatchets floating around, switching hands as gatherers pass through their teens and then outgrow the tools, giving them away or selling them on the cheap to people who need them.
Though the lack of "binding" or other mechanics that would make armor "single use" seems to be countered somewhat in that some gear is made from a lower level version combined with other materials to get the next iteration. The repair system though would insure there's always work for crafters even if the market's flooded with equipment, though I think that mechanic might need a little work too, since it seems to be kind of a hassle to find a crafter to fix your stuff if you can't do it yourself. Though if there's a repair wing to the sorted bazaars they're talking about I could see that working out.
I guess it interests me to think about how this market's likely to play out, dependent on the thrust of the player base and the mechanics we're given to work with as it is.