The price is still quiet high as there is always risk involved in accounts transactions. Good luck
I don't think there's any way to recover a Bitcointalk account once the email and security questions are changed. They both need to be done by the owner of the account. PM'ing a staff member or admin would probably seal the deal, as most likely Escrow will already be invloved. But if you're security questions and email are changed, there's nothing you can do to recover your account.
Incorrect. The easiest way to get an account back is to sign an address that was associated to that account, which then proves it's actually yours. There's no foolproof method of buying an account really. A level of either trust or ignorance is going to be involved.