So you make a new account just to ask this?
I can't even open blockchain.info right now. Why are you tracking the specific address? This seems odd.
I was browsing blockchain.info when I saw on the front page a transaction with over 3000 bitcoins, it got my attention.
Basically it's very likely to be Bitcoin's own version of money laundering.
When hackers or anyone who wants their coins less traceable, they can use a mixing service that will send their coins through many stages of mixing for a small fee. Normally 1-3% randomly assigned.
There always some illegal game going on in the bitcoin network while we think of holding our coins and make some money some crazy freak is getting millionaire out there fulfilling his life's desires.