Remember, what goes up must come down. Don't be greedy guys. 
Very true, but people dont understand it. They go mad in the dreams of getting rich. They keep on holding and holding and holding, thinking about becoming a billioner, but end up with no profit. At this time, it would be wise to sell atleast a part of your total btc and keep the rest for your dreams. Its obviously the right time to sell!Most people are selling their coins now but at a high market price and hence they are not able to find buyers. Exchanges are offering a lower price than preev.com and hence sellers need to check what price is appropropriate and how much profit they would get by selling it. Due to the hiked price, buyers are not willing to invest in btc and are waiting for it to fall.
Last time when it reached $900, after few weeks the price went up to $1300 and fell directly to $800. These instabilities indicate that we should just sell instead of buying or holding.
there is always a dip after every sharp rise ,until there isnt ........
be careful if you dump your coins prematurely and the price keeps rising
so you are unable to buy them back .........