I've developed systems for years, and have been trading one successfully for a while now on the eminis. My question is: if you are making good money consistently, using a systematic method that could be reproduced via looking at the trade history, is there a risk that a broker (who trades their own accounts), could capitalize on this information? I currently only trade 5 contracts or less, and go through a cheap and popular direct access broker mentioned on these boards. I manually enter the signals (not automated), and follow a system that would show a pattern after a few days of trading. Hold time is 3 minutes to a couple hours per trade, with 5-10 trades per day. My small size now probably doesn't appear on the radar, but I'm thinking of the future. I don't want to jeapordize a good thing any sooner than I have to. Any opinions from someone who is paranoid like myself, or from someone who knows more about this?