Supercell can add a new building where players can put resources up for sale then other players can buy these resources with the amount of resources the player has requested.
For example if I need 5k dark elixer for an upgrade and its too hard to raid then I could sell 500k gold for 5k dark elixer.
The resources in the building should not be raid able and the player should be able to reclaim them. This could help many players get rid up unwanted resources and help them upgrade the things they need. This system benefits all players and makes sense



