It's whether to be the sole trader of jewellery or armour that's the question... Everyone needs armour, but there's probably more money in jewellery in the longer term...
Having tried the Jewellery + potion route, it was not successful given the current quests. While parities would often have > 10 demand for damage and armour, they had relatively low demand for stat increases, really slowing down your growth. As it stands now I think specialised stores simply are too disadvantages compared to diversified ones.
