Calling an auction house a marketplace does not change the fact that they said they will not implement this design/which is what the auction house idea is.
The idea offered is a simple offline market place. Yes, i added in the idea the potential for adding an auction option, but as Snack and you have said, it got rejected by Gamigo in the past.
Hence forget about the auction option and lets concentrate on a simple NPC market place as ive seen in many other games. Ill even amend the original post the scrath the auction option off it doesnt create confusion.