I doubt the topic starter has this amount at all. He just posted this and never replied. Didn't want to hear out anybody, just burped out a question and left
I also have doubts that somebody would keep half a million USD in an online wallet, but there are such careless people out there. You just have to read the forusm to find out about people who held their life savings on MtGox or BTCe... Get a hardware wallet! Paying $100 to secure 100k USD is really a small price to pay. Have 400k and not doing it? Pure craziness. You're like that guy who climbs without a safety rope.