Yes, they can. Scamming isnt tolerated and the player can get banned.
Repercussions for Scamming Users
Whilst all trades between users are final, and traded items or gold will not be returned, this does not mean that scamming will not be acted on. Scamming is not tolerated and this policy cannot be used as a defence by players who engage in scamming.
Any user found to be scamming other players will be subject to the Celtic Heroes Disciplinary Procedure.
The disciplinary procedure includes warnings, disabling accounts, and banning them.
Many scammers get away with it by making disposable low level accounts, so I support IP bans. Once a scammer, always a scammer.