selling ure zp guns

For you people who have a zp gun that you hate i wanted to suggest a way to sell your zp guns. I have 1 i would like to sell because it is useless to me now with the new updates and stuff. I have a way to make it possible instead of selling it for zp and z8 loosing money how about you sell it for double the original price of the base form of the gun. For zp guns such as kriss that do not have a base form just sell it for a reasonable amount of gp because i know people who have 2 of the same crate gun. It gets fairly annoying having a gun you do not want in your storage so would you please think of a way to make this possible in some way?