Its almost a guarantee that this wouldn't be implemented. Why would Oasis allow the player base to infringe on their business model? Allowing competition from the player base who is 100% to sell lower than the shop, on top of the fact that if you cant sell it for ignots (removing the need for a player to recharge to even buy in the auction house). There is absolutely no incentive for them to invest resources into implementing this.
I'm sorry :/