I tried to deposit $10,199 via online exchange and received $10,18. Yes, there is differences between the amount but I guess that is because casino use third party which is in this matter CoinzPay.
As you can see, that is what is looks like in my Transactions History.
The difference is quite low in your case, it is around 0.20% only. Looks like Casinok has multiple payment providers available on their site.
My deposit was processed through 'Coinpayments', which is the most common 3rd party payment provider. Where they processed your deposit through 'CoinzPay'. Anyway, I hope they will work to add the direct deposit system instead of relying on 3rd party providers.