Interesting that you should quote Raschke.
A Google turned this up;
"Linda Bradford Raschke is the lead trader at LBRGroup, Inc., where she has been actively trading futures and stocks for her own account for the past 20 years. Linda started her career as a member of the Pacific Coast Stock Exchange in 1981, and later became a member of the Philadelphia Stock Exchange where she became a registered market maker in equity options. In the early 1990's, Linda became a registered Commodity Trading Advisor and formed LBRGroup Inc., a professional money management and commercial hedge fund firm.
Linda has been featured in numerous publications, including Jack Schwager's The New Market Wizards, and Sue Herrera's book, Women of the Street. She has lectured in over 30 different countries for Dow Jones and has been actively involved with the Market Technician's Association. She co-authored the successful book, Street Smarts -- High Probability Short-Term Trading Strategies, and has written articles on classic technical analysis for numerous publications."
If you were a trader with a successful mechanical system why would you tell Raschke you had an edge over her and the rest of the market?
The benefit of a well written mechanical system is that it helps to control emotions such as "perception" and a host of other feelings. When a trader uses derivatives such as CFD's with high leverage the pressure to be financially successful is immense and emotions like "hope" can have a devastating affect on the bank balance. However, a trader who has taken the time to write software code for a (mechanical or discretionery) system that they have traded profitably has developed a high level of confidence.
Peter