This is due to the nature of the skins market. Steam balance is considered less valuable, than real money, so we offer 60% of the Steam Market price for your items, which is still the best offer in comparison to other platforms. If you see offers to buy your skins for 80% or more, you may be dealing with scammers.
Due to an update on Steam we are not accepting CS2 skins at the moment. We are updating the algorithm for selling skins, we will be back soon