There will be *many* ways to implement merchant-type characters in PS, it won\'t even be funny.
For now, we\'ve heard some discussions about the possibility for users entering \"merchant mode,\" which will be visible in game as some sort of flag or other means of identification, and can then set up which items they wish to sell and prices for each. While this sounds like a good idea, we get to the arguments where people fight all day, store up their loots, then come back to town and go to NPC mode to get maximum profits. But this isn\'t the way it should work; fighters should fight and merchants should sell goods.
We know that at some point in the future, there will be player-owned shops (because I will have my own

), and player can set the kinds of goods they want to buy/sell and prices and all that kind of good stuff. Since merchants *probably* don\'t want to spend all day in the shop, they will probably have an option to hire an NPC merchant to watch the shop for them.
Venomdrop, if you\'re really interested in the topic, search the forums for other merchant-related threads. There are several of them, and many contain good arguments and suggestions.