I don't remember which one between Yobit or Poloniex but I thought they didn't charge any fees since the transactions were sent in batch.
I use sometimes Paymium for this reasons as I don't mind if the transaction is sent in 1 hour. I don't understand why not more exchanges use this method especially if they have large volumes daily
It's definitely not poloniex as I just checked it. They are saving huge bucks by having their users pay for their own transaction fee when withdrawing so I'm pretty sure they do not want to shoulder it for them unless they want to use it as a marketing strategy. But hey, since it is sent in batches, the fee's are cheaper since together it'll be used to pay for a single transaction's miner fee--- the batch.
Because they don't care about their clients?
Right right. Sorry about that!