Why do you say that?  I think that the price right now is at a critical support level, and if it went further down then who knows how much further it would go.  Sure they lose a small percentage to other people's buy orders, exchange fees, and the slight drop in price that they did cause.  None of that compares to the cost of holding the coins if the price went down.

I'm trying to think of a reason why that would be counter-productive but I can't.