I have been looking at dp and finding lots of members been banned, actually when a user is having a trade with a member and hasn't got hold of his email, its problematic for him to contact the trader and the other non-banned trader is puzzled as "why" the other person is banned, did he cheat some one or so on.. so my suggestion is, when a user is banned, he has a regular user title as Banned, if possible a little details on reason of ban would help others in coming to a decisive decision about why the co is banned, just like you can give a title as - Banned - multiple accounts, if this isn't possible, then at least a little info via Visitor Msg would give us a clue about why he might have been banned Most of the occasions these banned members re-appear in a new id, some times users don't report them as they have an on-going trade, so if this user was an cheat, the other trader gets a chance to be careful and report the "so" person to the Staff. This is just a suggestion, hope you consider it
Why a person is banned is nobody else's business. It's private and only between the moderators and the member.