Backtesting EA : Is it a Myth ?

For a relative long period, I have wrote several EA’s and try to backtest them in purpose to find wheter they are profitable. Some coder gurus have posted about procedure to get better backtest qualities. From getting tick data from Alpari’s website until disconnected MT4 platform have already done by me. I already got 90% backtest quality using Alpari’s tick data. The sad news is, almost (let