Trade website

It would be nice if once we posted items for trade, that the buyer can attach whatever currency the seller requested and it is sent to the seller without having to meet up and activate the trading UI. I miss a lot of whispers for trade as I am leveling/playing. It would streamline the trade and allow the player to passively collect the currency. In addition most of the time I discover the whisper it is only a few minutes later when I respond and the buyer has already moved on to another seller.