IMHO, Never keep your currency in any exchange, use the exchange, then secure said exchange off line. I looked into the Vault of Satoshi, the services they provide are expensive, they want ID (Government ID) and all that info you give them is held by them on their servers. That is not secure, that in fact make you a potential target for the Government as they could seize those servers and all the info they contain.
reasons btc has fallen over the last 4 months is
A) Silk Road being shut down.
B) Bad Media
C) Exchanges being shut down by the US Government
D) The US Government shutting down Casino sites for betting BTC
E) The US Government wants to use BTC for the USPS