Hi
When researching systems there may be 5 - 10 years data available. If the system shows that over the last 5 years, that only the last 2 have made profit.
Could this be due to the fact that trainers have improved with better facilities, training techniques etc.
From previous thread of my mine, I know using the exchanges instead of the mainstream bookies could make profit.
The system that I have researched has made profit over the last 5 years using estimated Betfair prices, but only 2 using the SP.
Also what is considered a good SR and ROI.
Thanks
Jackster