i think there are a number of steps -
- Valuation - someone needs to work out how much the item is worth.
The Pedler has a head start on this and can use a lore roll, otherwise a character uses craft to determine cost of raw materials and time to create item? The relevent crafting talent can add an automatic success and determine a rough enhanced value of a finely crafted item/artifact. Success gives a rough estimate for valuable items, between two value ranges. Each success reduces the range and increases the accuracy of the valuation.
- Find a buyer - I would say that it is easier to find a buyer for common items, but rare items are worth more if you can actually find a buyer. No role is needed to find a buyer for a common item. Common items can be sold for 50% book value. This can be adjusted by a manipulation role or the pedler talent, adding 5% per success up to maximum of 80% book price.
Convincing a trader to buy a rare item is a manipulation roll adjusted, with a modifier of -2 in a village or small settlement and modified further if the item is already for sale through the trader, as they are unlikely to want two similar rare items being up for sale. The additional modifier for duplicate rare items is -2 in a large settlement and -2 in a village. Success means the trader is willing to pay 70% of the value of the item, this is adjusted by the peddler talent or by additional successes. If the item is already available a trader will never pay more than 90% the value of the item, however if the item has never been seen in this settlement before the price can increase to higher than its book value.To find a private buyer make a Manipulation roll adjusted by -2 in a Village and then adjust the roll further based on the price that the item is being offered for as a private sale (each 10% below book price increases the chance of finding a buyer up to a maximum of +4 modifier, so in a large settlement a 30% decrease in value adds +3 but in a Village a 30% decrease in value only adds +1 as there is less interest). Extra successes will find additional buyers.
- Agree Price - For selling to a trader see above. Private buyers will expect to pay the price that the item was advertised at, failure to do this could result in violence.
If multiple buyers are found the Items could be sold via auction and this would be done using a performance roll. For every two additional buyers found modifiy the roll by +1. Each additional success increases the sale value of the item by 5%, there is no upper limit as sometimes people over pay at auctions.