I think it would be very unfair and embarrassing to the person for the mods/admins to announce to everyone "Hey, this person got banned for this that and the other thing!" I mean really. I certainly wouldn't want everyone on the forum to know that I was banned for whatever reason. I guess a poll could be done but I personally don't think it's a good idea. It's an issue between the mods and the individual only and it should stay that way. After that they can tell whoever they want via Skype, MSN, ect.
You know the problem with being the last of anything? By and by, there'll be none left at all.