Their hot wallet only has 6 million BFG tokens. If they paid out all the large payments right away they would have to keep refilling the wallet and it would slow down the process for everybody else waiting on a withdrawal. There are also security reasons and possibly compliance reasons for delaying large withdrawals. Considering how much the price has dropped they need to adjust what is considered a large withdrawal that needs significant delay. In the past 6 hours I have not seen them make a payment over $100, most payments are actually not even worth $10.