I think some people can't predict, although some signs are shown by indicators if the market to switch trends, anyone without that knowledge will obviously not get the best from it. So you just only losing money, when trying to predict a dump.
I do not really like the moments when some people try to control the market. I believe that this is artificial manipulation and full abuse of its capabilities.
I do not think that there is direct control with real levers of management, because only supply and demand can significantly affect the courses of Crypto-currency.