Honestly, the strategy in gambling can also be applied in trading, that's what you call the bankroll management and that is a great percentage to be an acceptable loses, but as a trader we do not stop with a lose but we learn from our mistakes to become successful.
Yes it quite the same as both is like gambling. I lose many times in trading, and also gain in some of my trades. Sometimes we have to make a sacrifice or unpopular decision in trading if we know we are losing more.
As of now, altcoins trading seems more on dumping mode as bitcoin is appreciating. More are selling for cash now.Though it can also be an opportunity.