In theory, yea.  If someone is really planning to take control of the money supply and manipulate the market, you could profit by just passively following the trends.  The risk you take is that maybe it's not a person, and maybe a malfunctioning bot?  Or some other weird story...

But, I'll keep selling to the wall until it's gone.  Especially when my profit switcher says Earthcoin is the most profitable coin to mine in any given period.