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) 
I think they take withdrawal fees based on usd. I started trade, deposit, and withdraw any tokens on hitbtc when btc on it's all time high price. And in that time I withdraw a token with only 20 of that token, and now when the price of that token down to it's all time low price, I pay about 570 token for withdrawal fee. Seems like the same amount of usd.
I'd never have any serious problem using hitbtc, I don't know why so many people having problem with hitbtc. Maybe I'm just lucky