There are multiple factors that contribute to a skin's value. Rarity is a big one, obviously, but the float value (the wear and tear on the skin) plays a huge role. A Factory New version will always fetch more than a Battle-Scarred one. Likewise, certain patterns on skins – especially knives – can be extremely rare and valuable. Specific weapon types also have their preferences; a popular skin on an AK-47 is more likely to be expensive than the same skin on a less-used weapon. A good place to get more information on the value of a skin is skin.club, as they provide a lot of helpful resources.
There are multiple factors that contribute to a skin's value. Rarity is a big one, obviously, but the float value (the wear and tear on the skin) plays a huge role. A Factory New version will always fetch more than a Battle-Scarred one. Likewise, certain patterns on skins – especially knives – can be extremely rare and valuable. Specific weapon types also have their preferences; a popular skin on an AK-47 is more likely to be expensive than the same skin on a less-used weapon. A good place to get more information on the value of a skin is skin.club, as they provide a lot of helpful resources.