it doesn't matter what they say, their actions are unacceptable. they have a volume of nearly 600,000,000 dollar each day and even if you only consider a 0.2% fee of that amount, it means a 1.2 million dollar pure profit each day. with that amount of money they must provide a much better service.
and i find it funny that all the other exchanges are working well but only they are under DDoS!
Don"t forget Polo get .2% on b ot sides so they actually make .4% on each transaction. That said I think they are doing the best they can. That .4% is their incentive to keep the machine working smoothly.