All manipulation moves cost money if other traders notice them. They'll just hold against you for the heck of it and profit.
So it really depends on how many people at what point in the "food chain" are around. If it's all sheep who follow active trends, the method wins. If it's all people trading on fundamentals and ignoring you, the method loses.
+1 There are many profitable methods to trade somebody else's market manipulation and better still unlike the market manipulation itself these methods are perfectly legal.