The items price on the GC Market are influenced by many factors, such as:
item rarity;
exterior;
category;
popularity;
demand level on various marketplaces;
and many other aspects.
Pricing in GC.SKINS doesn't directly depend on other trading platforms, including but not limited to the Steam Market.
The number of items we have in our storage is limited, which affects the price on the Market and the availability of certain things as well.
We do our best to provide you with a wide list of items to choose from while keeping the price affordable.