Folks often say, "Crafting is so easy, everyone can level crafts and craft their own gear - so there's no market!" Except, I know for a fact that this isn't true. Easy or not, a LOT of folks simply don't like crafting. There IS a potential market for crafted items - folks that like to craft spend a lot of time crafting, and folks that don't like to craft spend the same time doing Leves and FATEs and stuff for gil to buy stuff from the crafter. In theory.

In practice, the game throws so much gear at you, and you can do so much with vastly underleveled gear, that folks simply don't bother. The markets are flooded with cheap low-level NQ gear that drops from Leves and job quests, and the stat differences between that and HQ gear are small enough that the incentive to buy the better piece is low. To make things worse, low level dungeons drop gear for their level range that outshines even HQ gear assuming you don't socket materia. Between cheap NQs and plentiful Aetherial gear, there's barely a market for the crafted stuff.

Now, the OP wants to sell his crafted gear when he's done with it? Might just as well remove crafting from the game entirely.

Seriously, I'm not even sure WHY he wants to sell it. Even the most sought-after, premium pieces of iLvl 70 crafted gear are AFFORDABLE, even to a casual player, in a reasonable amount of time. In FFXI, pieces of gear like the Scorpion Harness or Noble's Tunic required weeks or months of grinding gil to be able to afford them. High-tier equipment in FFXIV can be bought in just days. I'm a fairly casual player, and even I could afford to buy a Vanya Robe of Casting, blow my nose in it, and toss it aside.