CS:GO skins and all other Steam Market items are subject to a $400 maximum listing price. Items are often sold for greater sums through key trades, a sub-currency of the CS:GO economy. A single CS:GO key costs $2.50 USD and can be sold on the Steam Marketplace. To break through the $400 ceiling, you convert your listing price to a key value. If you want to sell an item for $500, divide your listing price by the key value, 500 by 2.5: 200 keys. Most people use third-party trading websites to list CS:GO’s rarest wares, but once a trade is made, those keys can be sold back into the Steam Marketplace.
There are some skins in our list that definitely break that cap, but due to both the extraordinary rarity of these items and their inconsistent prices in the key market, we’ve pulled our best estimates from varying trading sites. These are subject to change on a whim, but remain impressive no matter how transitory.
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