Infact if you ask me, a perm mute is much like banning someone, as usually players who are perm muted tend to quit the server due to rage or the fact that they can't really speak in chat. This likens the un-mute fee to an un-ban fee because it really highlights how both players end up in the same category, making this idea even closer to the un-ban fee, which I feel why it should really be right by its side in the store.
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Again, you could say the same thing about people who've been banned, so might as well deny them the un-ban fee right?