I think what you are suggesting is that the movements are random.. if they are, you are probably correct?
Also, it is highly dependant your system and the way you trade. Eg I don't use any indicators at all. We Australians like to trade on a plain chart
Your system is very interesting... what pair do you normally trade?
I trade mostly the aud/usd and for that pair, i get on average just slightly less than 50 pips / week.. obviously a lot to be desired and improved on..