Watch the Sell forums obsessively.
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Just getting started in the trading world
LiQuId StEeL
PtiteDiablesse
Generally, prices are based on the item's skin, requirement, inherent mods, then upgrade mods.
Certain skins are extremely rare, therefore a weapon with that skin will be much more valuable than a less popular skin. For instance, a Crystalline Sword (arguably one of the rarest sword skins) with any mod on it, is going to be easily worth more than ten times a perfect falchion (the least popular skin) that may, for all intents and purposes be vastly superior to the Crystalline in functionality. Generally a rare skin can increase a weapon price anywhere from twice to 100 times a normal price... or beyond.
Requirement is also important as to a weapon's price. Anything over 10 is severely going to impact price. A requirement of 8 is generally regarded as being perfect, with a requirement of 7 being pretty much the pinnacle and which will greatly increase the price of a weapon (a perfect req 7 weapon can be worth 80K+ more than a similar weapon with req 8).
Inherent mods are also very important, with max mods generally worth much more than non-max ones. Also, any inherent mods that are either unconditional (unconditional weapon modifers will generally drive a weapon's price into the millions) or all-the-time are generally worth the most, followed closely by the >50% and stance mods.
Upgrade mods are determined last. Generally, you will see a lot of weapons with a perfect 10/10 sundering mod and +30hp fortitude mod. This is purely to drive the price up, and a lot of people remain split on the worth of these mods on a weapon (generally, half the community feels the 10/10 mod is a waste and not worth the extra money, and half feels it adds to the weapon, and is a great mod. I personally fall into the former category).
Lastly, being able to price somewhat accurately is also very much dependant on your experience. Best bet is just to watch sales and auctions and see what certain things go for. That way, you will have some sort of basis on which to price similar items.
Certain skins are extremely rare, therefore a weapon with that skin will be much more valuable than a less popular skin. For instance, a Crystalline Sword (arguably one of the rarest sword skins) with any mod on it, is going to be easily worth more than ten times a perfect falchion (the least popular skin) that may, for all intents and purposes be vastly superior to the Crystalline in functionality. Generally a rare skin can increase a weapon price anywhere from twice to 100 times a normal price... or beyond.
Requirement is also important as to a weapon's price. Anything over 10 is severely going to impact price. A requirement of 8 is generally regarded as being perfect, with a requirement of 7 being pretty much the pinnacle and which will greatly increase the price of a weapon (a perfect req 7 weapon can be worth 80K+ more than a similar weapon with req 8).
Inherent mods are also very important, with max mods generally worth much more than non-max ones. Also, any inherent mods that are either unconditional (unconditional weapon modifers will generally drive a weapon's price into the millions) or all-the-time are generally worth the most, followed closely by the >50% and stance mods.
Upgrade mods are determined last. Generally, you will see a lot of weapons with a perfect 10/10 sundering mod and +30hp fortitude mod. This is purely to drive the price up, and a lot of people remain split on the worth of these mods on a weapon (generally, half the community feels the 10/10 mod is a waste and not worth the extra money, and half feels it adds to the weapon, and is a great mod. I personally fall into the former category).
Lastly, being able to price somewhat accurately is also very much dependant on your experience. Best bet is just to watch sales and auctions and see what certain things go for. That way, you will have some sort of basis on which to price similar items.