If you take the time to identify good traders to copy you aren't taking any more risk than when trading your own account. That is to say trading is inherently risky, and there is always the possibility that you will lose money. Also note that the past performance of a trader is no guarantee of their future performance, so even if they've been profitable for three years running, they could have their first losing week right after you decide to follow them. As always, never invest more than you can afford to lose.