hitbtc is one of the special exchanges in cryptocurrency. In hitbtc we have an account type, one is trading and the other is main account. With this feature, users can easily separate the currencies they want to trade and the currencies they have bought for long-term storage.
Another reason I say Hitbtc is special is that the fees for withdrawing currencies are all the same, and for example, if you want to withdraw 2 bitcoins or 0.02 bitcoins, you have to pay the same fee. This is good for high amounts and bad for low amounts.