You can earn more money from gambling but You can lose all your money.
the secret is a correct management of money and a good bankroll.
Correct management alone is enough even with a small bankroll. Because, many people are making some big amounts from gambling just with faucet earning.
You may be right. Because with the right management of gambling like a applying the right skills at right time and choosing proper bet amount with respect to our bankroll, with these we can make more profit out of gambling. But we need luck also to favor us.