Wow, I had no idea that Risto had thousands of BTC in interest arrears. So he pulled a Trendon Shavers when I thought that it was just all fun and games.
He went mad and started promising all sorts of crazy interest to people he was defaulting. In the last few days he was advertising arbitrage opportunities, in his game currency, on the forum. Hopefully no one bit.
The money wasn't all money people had put it, there was an element of trading and earning. Withdrawing was the ultimate issue.