Treat gambling as a small business. Once you get your capital money back in your pocket plus 200% profit, you'll maybe use 30% of it and bet it again... if you lose, you'll try another maybe 10-20% again from your profit... and so on. it won't stop..
This is nice way to make more and more money but it needs practice to win from any game and not good to make castle in the air. We should invest small amount for gambling at first try as you needs to practice it. So I think we should take start from investing only 20 percent and then with passage of time we can increase this ratio ti win bigger.