the idea is pretty basic. there is an iron man mode where you can't stake, pk, and trade or interact with other players whatsoever.
the idea of copper-man mode would be that you wouldn't be able to stake, however you still would be able to trade with other players. the transition to copper man mode could be done at any stage of your account, but it could not be reversed to the way it was before. to players who will say "you can just ask your friends to stake it" i'll say only this: i know you will be able to ask your friends, but adding this game mode would just give motivation to build the bank you wanna build yourself, and it's not always easy, when you have an addiction to duel arena. this game mode wouldn't affect economy in anyway.