Altcoin market is damn down . Almost coins are down so its buying time and sell them for a quick profit cause after every day touching lowest they go up for sure . So i think atm traders making quick profits .
Dont BUY any coin untill August 1 wait for the good time to buy All devs and Whales are watching Market only not trading anything ..
only the BIG Whales playing with bitcoin
Traders don't have to make buy and sell for the coins they hold. In poloniex, there is margin trade option which is good if you're okay with short positions. And you can still earn a lot.