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What is the point of both users and staff wasting time on reports for users that have already been permabanned? There's enough work to be done here already without having to deal with stuff that has already been dealt with. It takes a colossal amount of time and effort for people to report copy and pasters and provide all the evidence and then it wastes staff time having to go though them all needlessly. If the user was shown as permabanned then they can just ignore it. Once a user is banned here their account is done for so I don't think it's a big deal showing that. Many other forums show even temp banned users. It would be helpful in other ways too. You could be doing business with someone and they could just disappear without warning. If they've been banned then at least you'll know why they've mysteriously gone AWOL or are not responding to your messages.
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If there's no or little intention to show if a user has been banned (e.g. changing the rank to 'Banned' or 'Tempban' or something similar), it would be also helpful to just deactivate the 'Report to moderator' button for banned users.
This would not affect the everyday forum member, because it's only a minor part of the members who use that button, the majority won't even look at that button or even notice the existence of it...
But for those who report, it would be really useful.
Also, (it has also been suggested too) if this button would be deactivated for posts that has already been reported, it could also boost the efficiency of reporting.
So if someone only see that there's no Report to moderator button, it won't tell him/her directly that the user has been banned because it could be the post itself too, that has been reported...
This way ban could stay hidden but reporting also could win with it...