Yes, but the pendulum swings both ways. The percentage “up” (4–8%) can just as easily be the same percentage down. (NEGATIVE 4–8%). The real key is:
You really have to be willing to spend the time to learn it — several years worth of learning.
You have to be able to survive the losses — and not blow your account.
You have capital to be able to pay your bills while you learn it — outside your trading capital.
You have to be able to keep your emotions in check so you can make good decisions — not emotional ones!