The question will be whether this was a "hack" or an inside job with "hack" as the excuse. ;-) All too often it is the later while blaming the former.
One hopes that as part of their business they included insurance for this type of event.
They have a big working bussines, only with the fees for the margin lending (about 15%) really do you think they would kill his own golden chicken?
People doing inside jobs don't care about what they have/are earning. Just take Mark Karpeles as example. He had around 100,000 BTC and he still made his exchange collapse to steal around 650,000 BTC. Greed takes over their mind.