I notice that when there the price is going up so many people are joining the train and they also buy because the price is going up and they are going to make a profit, why people are not buying when it is down when the price will eventually go up and they can make a lot of profit.
I think people who buy when the price is going up is that they know that the coin is on the uptrend. they have studied the flow of the market and they are running along the bullish cycle. Amassing a good amount and then sell when the trend is going down. Getting some gain for themselves.