Again we saw an exchange got hacked. There would be nothing to hack there if people didn't keep their coins on exchanges! For the love of Dog (lol), don't keep your coins on exchanges, start practicing safety, this is your investment we are talking about!
How to, not to keep your coins in exchange if you are selling or buying coins on it. Ofcourse for you to get good profits you need to stay your coins on the exchange and do day trading, we cannot predict when the hacker came to hack the exchange, meaning the exchange didnt have a good security because they got hack. And traders suffer that fault from exchange.