Mate
Also, apparently player X has priced it so high because newer players don't have a clue about that fact.
I'm not aware of any instances where people are intentionally trying to price gouge new players, even if occasionally players buy and mark-up others' goods, it still is either very little difference because those items have a low base value, or the item is just not going to be bought anyway...
I was keeping track of the market value of things like magic amps based on the Blackmarket auction and bazaar prices. But both of those sell higher than +9999% which is the standard maximum in the merchant (although higher % can be done...).