indeed great idea's  but maybe the merchant skill could be like negotiating with npc sellers and bringing down the price kind of like a persuation skill the higher the skill the cheaper u can get the items which mean u can sell them to players for normal price just u have made a profit on them

good idea it happens on wow but its just the lower level players could become very aggro if they keep dying to random monster raids but if this idea is to follow through make sure its either 1: at a place that is restricted to higher levels
                                                                             2: at a place that has guards that could help so its optional wether or not u want to join in

            thanks 

lol an easier way to see if its the game or your computer specs' is to look at the system minimum specs'  just a suggestion lol