My dear friend all i got to say about it is that people normally sell off their btc when they find their investment at profit they normally tend to cash out their investment once they find them at a higher profit level and it normal tendency of every investor not just that happen on btc it happen in every forms of investments for the investor to cash out their investments when the find out that the market is running at profit so its no new thing for the investor to cash out their investments at profit ratio.There are also some investors who do selling when they find their investment at loss as it create a panic situation for the investor which result in selling out their coins some often do it and end up on loss as they think that the market will continue to sink and they think that it will not recover so in order to cut loss some even sell during loss