Strategy not just to win but also to save money from gambling, so you wont think that this is just a way to lose money. Trading is an alternative that works like a gambling where you need to study or else you will lose. If you just want to have fun on gambling, then its fine to lose money.
We must remember that everything should be handed in the right way, including gambling. When you play gambling without the right strategy, it should lead to losses in the end. I agree that people who just play gambling carelessly, they only waste time and money there. I doubt if playing gambling will be fun if we always lose money.
Perhaps, that will be fun for them because they can enjoy the game. As long as we can having fun and enjoy the game, it will not a waste of time and money especially if we can control how much money we use and we can control ourselves in a gambling game.
Making a strategy could be useful, but that is for a game that needs a strategy. But for the game that is base on the luck, the strategy won't help much because we depend on the luck itself.