[Saxon]

I agree, you should be including opportunity cost in your calculation, a kind of labour charge. The loss of 10 RP is worth something, but how much in gems or gold is hard to pin down. Not including the labour time is like selling a car for only the cost of the metal. Technically, you should even include part of the cost of the research that allowed you to forge the item, but that is going too far for this game.

However, the price also has to include what you are getting. Future cooperation or the value of an item you can not get any other way is hard to quantify. These intangibles make pricing even harder.

Another part of what you need to calculate is what you are trying to do. If you are doing an Ulm forge for profit scenario, you need to get good volume, which might mean lower prices. As Dom is not really a trading game, most deals will fall into the category of politically motivated trades, so you may wish to focus on that.