[kittychloe]

if you only take into account the ones that have actually sold it should give an accurate average of the value, don't include the one for 1k for something that usually sells for $200

its pretty much the only option we have at the moment until someone creates a massive database of median values for videogames and even then it would be the same process as most other collectibles

original sale price - quantity made - quality of item - known quantity left in existence if possible - average value of sales over the last 6-12 months or however far back the last sale was