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What was written above really amazes me since my results are completely opposite.
I've been writing trading systems for 1.5 years now and while there are many concepts that can be profitable, MA crosses for certain currency pairs (not all of them though) is one of the most profitable approach. After having written so many systems, i did not achieve any dramatically better results than those from MA crosses. So even if i had used only that, it would've been sufficient.
MAs have been around for a very long time, everyone uses them and they still work! They are trend-following and as long as there are trends they will work.