This is unlikely just due to increased load after massive global media attention, is it? Look at all the other exchanges, even small chinese ones like bter.com handle it fine...
Anybody here any idea what is going on? I cannot post in the main forums yet.
Just divide all the fiat money supply that exists globally (in USD terms based on current exchange rates) by 21 million (= number of bitcoins). This will give you an upper bound, and it will be around 10 million USD per BTC.
Well, it will become unprofitable soon. Unless you have cheap or free energy, because the difficulty will increase when the price increases. And there is a delay between the two.