When the price moves and I find a decent price to buy at.
Haha..fluctuation in price still profits, specially to those traders who wants to short.

they buy it at low price and sell after when the price moves up..

And it is hard to sell to people at fluctuation at lowest , as everyone will start to buy and no one will sell. But the traders at trading sites can be benefitted with it easily, and it is a nice and profiting time to start trade at this time.