How much commission is implemented, and what's the reason behind it?

Why do we implement commission?
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If you are a Funded Star, we strive to copy your trades to our own corporate live accounts. On our own corporate live account, we pay commission. So if we wouldn't charge commission, we cannot copy trades your trades to our own corporate live account, because it isn't replicating real marketing conditions.
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​But why do we implement commission on the Challenge Accounts?
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The Challenge is there to validate your skills as a trader in our gamified experience. So in The Challenge we also validate if you can deal with commissions. If we are changing the conditions from the Challenge to the Funded Star environment, the Challenge isn't making sense.