I was brave I bought some coins in the past that today gave me a certain profit, but the market is very hostile, you will not know what can happen to your altcoin that is in hold! It's all a matter of speculation and luck!
If you can read and you have good speculation you can earn profit in doing trading. But, I think it's not about the luck but its about how skillful you are in doing trading. It's hard to become intelligent trader but if you keep learning someday you can become skillful and wise trader.
a good speculation will always made a person into good form of his stage in his field more stronger but everyone does not have the ability to do that but some of the investors will do more effort for them to get the better profits.