The fees are too high right now, indeed. But I think in some months when the volume would grow - those would decline.
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I think they are only using the percentage method to where just like other local exchanges has applied. For example, a local exchange will take 5% of the total crypto traded in their exchange. This is the usual event that will take place in an exchange. So, whether we like it or not because we need their service then we have no other choice but to pay the fee required in order for the success of the trade.