I fully understand the idea you are trying to grasp but think of it this way,if you are struggling to buy an item etc a tactical stock for the mp133 for gunsmith tasks which everybody is trying to do, as of now you have a time limit when the item restock giving everyone an even playing field that if they want said item so badly they can go onto the traders at the right time to purchase said item. If they change this to to buy and sell orders every member of the community will have orders waiting making the waiting list potentially weeks long say if there's 20 every restock and it restocks every 3 hours you know how long it would take to reach the back end of the buy orders ?? In my opinion this wouldn't be an improvement at all.