Withdrawal fees are associated with the network fee and the cost of each withdrawal transaction is required to be paid by GokuMarket on the users' behalf.
Please note that sometimes exchanges run promotions with reduced withdrawal fees as a marketing cost. GokuMarket always aims to have inexpensive withdrawal fees, yet at the same time to cover the variable transaction network fees that rise and drop from time to time.
If you do come across a specific cryptocurrency on GokuMarket that has a higher than usual withdrawal fee, then please let us know by sending an email to firstname.lastname@example.org. Such email has to include the screenshots or public URL links from at least two other exchanges, showing the significantly lower withdrawal fee for us to investigate further.