Hi vlom,
Isn't that risky to hold money on an exchange? I lost a couple of BTC on MintPal, and almost lost some money on Cryptsy (had to sell coin for Doge at a bad price to get out). Since then I try to never keep money on any exchange (even if it's supposedly safe, like poloniex).
I really don't know about this question but I think it's a risk to leave such amount of money in an exchange basically in a low level exchange.