Billbss has valid points. While I'm new to this site, I'm not new to FX trading. One thought that I had, is that if someone subscribes to the theory that every market move is mathematically random, you can blindly enter positions with varying TP and SLs, and your accumulated mathematical outcome will be a big fat zero. Then - as Billbss indicates - factor in your spreads, and your P/L will simply be the spread x the number of trades you made. Daytrading? Bigger losses. Longterm trader? You have losses, but not as large, since your payments to the "House" are less frequent.
But - ignoring all those wonderful mathematical indicators like Bollinger, MACD, etc. - if the theory of "every move is random" is true, why is it that some actually make money in this market? All I can figure is that someone has to have that "edge" to overcome the inherent disadvantage we all have in overcoming the accumulated hit from the spread-costs. Is that edge the mathematical indicators? Fundamentals? Perhaps. We need something to overcome the ultimate, consistent winner in this game, and that is "The House". The house will always get its cut [That's why Vegas does so well]. Yes, at times you get someone at the Blackjack table that scores, and scores big. But given enough players and enough time, the House always wins.
So, it's up to us to cheat the theory of "everything is random", by getting that edge. By getting into the same "plan" as that Black Jack winner. Getting that edge.
[I'm still looking for it!!!]