Quite a pity.
Every exchangers need some fees to earm some profit also every traders and investors even trading theres a fees also for exchanging buying or selling some altcoins in exchanges.
By adding some fees trading, the money will be useful to maintain or to pay the other services that they have so they can continue the exchanges so the exchange doesn't have any trouble in the future. Trading fee is not just for their profit but it's also to cover the other fee that sometimes happens without they thought. So I think it is normal if they have a trading fee and besides that, I am sure that the fee is not too big than the trader's profit so for me, it is not possible to see the zero fee trading in the exchanges.