There are better ways of doing it with more real simulations like Monte Carlo Simulation etc
Bcos in theory Batting Avg is like paper avg. but all trades may not be entered as per our liking ( forward test ).
So after you have a system, run it with MC and see how the edge behaves at 70-75% random entry.
And from the image you posted, its evident even without the Math
Risk of ruin is very obvious when you have 21% vs 2% loss per trade.
Bcos in theory Batting Avg is like paper avg. but all trades may not be entered as per our liking ( forward test ).
So after you have a system, run it with MC and see how the edge behaves at 70-75% random entry.
And from the image you posted, its evident even without the Math
Risk of ruin is very obvious when you have 21% vs 2% loss per trade.