Probably Goldsmith as everyone needs accessories. armorer is highly unlikely as only some people can equip it and not everyone needs it. DOM classes have no use for armorer at all and some DOW can only equip leather making for less potential customers. Just bear in mind what they want you to do for profit is to use a miner to gather ore and smelt it into ingots to sell to the 50 Goldsmiths. Takes a lot of time and patience to get there so it's not for everyone.