I assign a price to a variation when it is in stock and for sale. Once it is not in stock, it continues to be available via the MushroomVillage ID Guide, but I made no attempt to keep pricing there current at all. If I had more of a piece to sell, I would update the pricing, but if it remained out of stock, the price might no longer be accurate, as market conditions change.
I was aware a lot of people were using my pricing as a gold standard. I didn't want that to happen, so I changed my ID Guide to be a "Rarity Guide" rather than a "Price Guide" - I moved to a system of assigning 1 to 5 stars to guage the rarity of a particular piece.
I typically set pricing by using the Katalog IV value, which is shown in Euros. I convert to US Dollars using the current exchange rate, and then subtract 15% as my asking price. But I do not always stick by that rule. Some pieces are valued low in the German guide because they are relatively easy to find in Germany. If the piece is a Europe-only release that would be hard to find in America, I usually sell it at a premium to the German Price.
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