Mobcoins come very handy when you're trying to obtain commands, spawners, or some really nice in-game items. Although, if your plans are to earn high amounts of money, you can find player warps which buy those mobcoins.
If you want to sell your mobcoins, you can do /mobcoins withdraw [amount], in order to withdraw the specific amount of mobcoins you want to sell.
If your intention is to keep the mobcoins you have worked hard for, trade them in /transfer for some really cool and useful items.
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