It wouldn't be even necessary. The 1000 USD is relative to the current price I suppose. So if I have access to an account with 500K bitcoins and I sell 400K bi

It wouldn't be even necessary. The 1000 USD is relative to the current price I suppose. So if I have access to an account with 500K bitcoins and I sell 400K bitcoins so that the price drops to 0.01 (like it did), and then I transfer the 100K bitcoin left in the account to my bitcoin address(and I can with the driven down exchange price) when the price goes back up I would have made a killing.