Darky could be on the right track because if you blindly bet every race you are bound to lose out.
My eight races worked for me today because they were eight from approximately thirty races that I could have bet keeping in mind I only bet Ratings 70 and above. Five of those races were winners BUT Flem R7 got home by a pimple so that turned a good day into a much better day. But I think selection methods and the race selection are two areas that we should be looking at.