1. Deposit 1USD to a dummy account
2. Create 10000 bid orders of 0.01BTC at $0.01 slowly (without creating lag)
3. Sell off
4. Rapidly adding new orders to the dummy account
5. The MtG card trading engine is forced to re-evaluate the validity of the 10000 bid orders
6. 30 minutes lag
7. Profit
Does it work?
As it would be a one-click decision to disable this opportunity, yet Gox does not do it, despite frequent pleas from everyone I know, it can not be attributed to incompetence. They are doing it on purpose, and it is left to the reader, what this purpose is. (Please continue to sell off your coins at every instance of lag, you will be sure the lag remains until all your coins are gone.)
If I ever set up an exchange, such charade would never find its way to the order book.
Oh yes, and the decision to abolish trading fees, what bullshit. I would have added a $1 upfront per order.