Really I'm very upset with this exchange... They have one of the most expensive withdrawal fees I've ever see... I saw this kind of abusive fees in other exchanges like yobit but I tought HITBTC will be a little more serious due to the fact its great volume... They don't need to charge those abusive fees... Really... If they doesn't change their politics I think I will withdraw all my fund from there (despite the fact they will thieve me in every withdrawal I'll make) 
It isn't really that good of exchange in the first place. I've only been using it to trade new coins because they are usually listed first in hitbtc. It's also annoying that they have limit the minimum amount of some tokens that you can exchange. I sometimes have a small amount and I can't get to sell it because it requires a minimum 100 coins to create an order.
Support and their security is bad too. I have my old accounts filled with failed attempt of log ins from someplace I don't know.
I'll suggest you consider using a better exchange like binance if you are looking for a high volume exchange.