That is about what I would expect... Cherry picking the "best" systems that happen to be on top for a month is no guarantee of success.
Can you elaborate? Two weeks worth of trading? 6 months? You are up 5%? 50%? The problem with cherry picking is, that many times the top systems are only on top due to statistics - SOMEone has to be on top out of 300 systems. I would not touch anyone without a relatively long, decent performance. Also, someone who has relatively high PIPS per trade. The 1 pip per trade plus spread is a large cost already before trading...