Actually, you are very wrong in what you are saying. If you can't backtest grid trading, then I can only recommend that you find yourself a broker that can give you proper tick feed. I am currently backtesting a grid EA that's bidirectional with hedge. Although looking at my MT4 in visual mode, it is fairly slow. It takes almost 2-3 times for 1 year old information to run at tick mode, but I am doing it.
For anyone's information if it is useful, if you grid trade you would require approximately #500 a 0.01 lot traded so your account does not discount. This is based on a 10 pip bidirectiononal grid hedged at a TP of approximately 100 pips. Although it can be lengthy, it is my belief that grid trading bidirectional at a market on the GBPJPY or equally volatile pair is a no drop system. You merely want deeper pockets to have your cash breaks down to get a great length of time as some hedges do not shut until 4-6 weeks following a Dollar starts. If you are patient though, I think it is a route to financial freedom and a stress free method of trading rather than spending countless hours staring at the screen and to get a less academic that fights with finding a egy that works for them.
Only my 2 pennies even though this thread is very old.
Cheers!
Daniel