someone said it use to be you had to be verified to withdraw even bitcoin, but not anymore ( i guess they wanted to cover their ass while the laws we're clear )
in any case its probably a lot easier to send in some fake ID to get verified at stamps and withdraw bitcoin then it is to fake a bank account and withdraw fiat.
BTW, what if a lot of the downwards pressure has come from stolen MtGox coins being sold off? If that was the case, wouldn't it cease now?