I had read (Bix Weir, roadtoroota.com) that the Silk Road seizure was used to
MANIP-MANOP the crypto markets. Of course, they could sell really low and have a buy order set to retrieve said cryptos and re-use it again and again. They have plenty of folks being paid to monitor markets and buy/sell orders, and run it thru an exchange that would guarantee they get the coin at the prices they want. If such a vulnerability does exist. Maybe the forks have eliminated these possibilities... ?
Just my theory, please enlighten me!