This idea is only cool if you can tame generic humanoids with gold. I dont know if you can, and i do not feel like testing it either. That being said... Say you can tame humanoids with gold , that would allow you to manage the merchant like you would a caravan. Merchants get all kinds of gold and they could use it to tame an outlaw or a bandit not unlike a traveling caravan would pay mercenaries to protect the its goods from highway men goods. Merchants can also double their carrying capacity at level 12 (i think) much like a caravan can haul around a lot of goods. Once you get to dwarftown with this "caravan", try to tame one of the wandering guards and equiping them with the best gear gold can buy! A hostile dwarf confronts you in the big room? Give him a 1000 gold to be your body guard! Well you get the idea, carry around a shit ton of items and pay people to guard you all the while making sure they level up, as well as equipping them.
What do you guys think?