The broker system is already in, so I dont think it should take anywhere near 6 months to add the buy order part to it.
I do believe that it is a mistake for SV not to have the buy order system in currently though.
To give new players direction to get early gold, they should be introduced to the buy order system right in the haven tutorials.
But sadly that does not seem to be happening since the system is not even in and they are working on the tutorials now.
The buy orders also naturally change regularly as they are filled and new orders are added.
So there is a reason for players interested in filling them to check them often as well.
Dont take me wrong. I may have agreed on such an npc in the past.
The difference between the buy orders and an npc task giver though is that the buy orders are completely player driven.
In the end I feel it is better if NPC's did not take roles that could easily be filled by players.
In a single player game it is all good for npcs to take such roles. But not so much in a game designed to be player driven.