Then if you check around you can see users receiving their sentences reduced after review. It's actually working out rather well from what I can see.
Then, now they (unbanned users) started to ask for reduce sentences of their signature bans. It is a basic greedy instinct of human. We might see a new wave of suggestion topics on reduction of signature ban period. 
I think at the very least state the reason why the account has been banned? I always see posts asking why their old account has been banned from the forum (hence I assume that no one will state the reason of banning your account the moment you are banned?)