While the simulated brokerage account starts with $500k, we don't show a running balance. Instead of a balance, you should check the P/L Report (accessible from the Autotrade menu).
This P/L Report shows the profit and loss for each system that you are AutoTrading. This same report is displayed when you are trading a real, live brokerage account. You must remember that we don't have access to the balance of your live brokerage to show on C2 (you can view your account balance from your broker platform). So we want to keep things as similar as possible when it comes to what we show on our website.