Your argument is that once it's high risk, it's gambling. Sorry but that is just not the case. It's a ratio. If you don't understand this, then I agree that you should stay away from anything that involves risk management.
Let's say we play a game where you throw a coin 3 times in the air. If it's not 3 times head, I'll pay you $1. If it's 3 times head, you pay me $10.
Your chance of winning is pretty high, while my chance is low. Yet, I would love to play this game.