Well, they frequently say that the trend is your friend, but I believe that the same rule does not apply if you are a whale or a market manipulator.  If you are a whale/manipulator, then you want to maintain some control over the rises and falls, and of course from time to time, even the manipulator will have to let the trend go when the momentum is working too strongly against his/her/its ability to control it.  Ultimately, keeping the situation in control is going to be much more profitable for someone with a lot of capital and moving the market...... and if the price goes up too much, then it takes more capital to control it...  and then there would be a problem with new entrants and other whales trying to get a piece of the pie.