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I think its only happen when you buy the top rank coin .I think that this selection way of trading can increase our profit ratio .It also makes secured platform to invest .If it happen loss there, easily can get profit from other coin.So we should choose the top rank coin to trade .
Sometimes there are many people who don't understand the trading market, only see a price that goes down to buy a coin but don't see the information first or for example a coin that has gone up and is in a downtrend or downtrend and then the coin will delete on the exchange and the coin is scam
this is a problem for beginners...
most of them are fooled by the chart on the screen of exchange without first analyzing the chart. when they see the graph changing, especially on exchanges that often fake volume, they will make bad decisions. I am not a professional trader but I prefer to trade on only 3 or 4 exchanges that have real trading volumes so I can decide what is the best [buy or sell].