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1> In a real market you are charged on completion, not on offer. Right now if you pay for a slot, then need to change your price, it costs you the slot money. This is making the market expensive to use and illiquid. The market is powerful feature, the game encourages us to use it, lets please make it efficient.
Indirectly you have given the reason why this suggestion has been rejected many times before. It would give rise to the TO being filled with `spam' and un thought out trades. You have a free slot ( x4) to get the price right, and can change it without costing you anything, The TO is working nicely as it is IMO, giving the Dev's a reason to break it is not a good idea ;)