I sorta disagree with this whole thing because I always thought that NPC?s are there for mainly quests & a majority of the role-playing aspect of the game?
Also, I though NPC shops were there to sell items @ a somewhat-high-price & buy things @ a lower price then the object is actually worth, I think they sort of set the standard of buying & selling stuff, so if someone wanted to open a store, they couldn?t have there stuff overpriced to rip off there costumers or they would just buy from the NPCs?
But I do think it may be important to adjust the NPC buy/sell prices somewhat to simulate the market would be nice? If you wanted to open a store, there should be an Yliakum Market Prices Chart or something.
Also there may be some npc?s that will sell you stuff from warehouses @ a low price if you buy 20 of them, if it was a sword for example, small items means more? although this may not be good because of people working @ a blacksmith would loose out, so maybe there is a blacksmith, & if there is no blacksmith to run it, like if there offline, then a NPC comes in & takes over until someone wants to be the blacksmith, there should be able to have more then one @ a time?
Ops getting long?