If you don’t make a profit, you don’t pay a penny.
You only pay a percentage of your profits. So if there is no profit, you pay nothing. So, it is in our interests to make you as much as possible.
The broker will charge you 30% of your profit each month.
The fee is on a high water mark basis. That means that if profits have risen to 15% in one month and the next month there was a loss (which has not happened to date), then there would be no more fees paid until the profit was above 15% again.