Thorns
I have no idea of what the EI is. But I offer an observation. I just finished back testing the 107 free systems with Bet Selector. I had that running on one computer while I was merrily working away on the other. The systems ran from the latest date 30 Dec09 to the earliest 1/10/07. a good potion of the systems ran in profit more than three quarters of the testing and then died in the last 6 months. Retesting them for 12 months showed them very profitable. I did also note that the systems in general were very cyclic. Few got in to profit and stayed there consistently.
Beton