There's a major pitfall here: pending orders. In a market with high trading volume, your orders can easily be canceled by the system. Therefore, all aspects of protection must be extremely robust. Why are we so sure the expert did this? It's from their buy-on-two-sides strategy. A normal person might make a profit by placing a buy order low and a sell order high, capturing the difference. The expert, however, locks in profits instantly by buying on both sides—why not by selling?