赌徒套利交易系统 (Gamblers carry trade system)

Here is my system for carry trading

Open an account with two brokers. One that does pay interest on the GBP/JPY pair and one that does not charge interest on the GBP/JPY pair. Buy at the broker that pays interest and sell at the other broker.

Does anyone know how much it is possible to earn each year with this system if you ad new positions every time you have earned enough swap to open a new position?

Edit: Margin calls does not matter much because when you get a margin call at obe account you have earned the same as you have lost on the other account. If you get a margin call you just have to transfer half of your money from the one broker to the other and then you are back in business.