Hypothetical Performance is calculated based on price data on history of market.
Performance can vary if parameters are set in different way.
Therefore, an EA can be profitable on one sort of setting, yet draining on the other round.
It is also anticipated that in over 90% of cases, real result will be the same as hypothetical performance if the same setting is applied.
Of course, GuruTrader provides its client with the best sort of setting: ready and preset.