winning and losing in gambling is just like brother and sister. no one can tell you that either you will win or lose your own investment. it is a game of luck and if you are luck then surely you will win and if not then possibly lose your own. no you have to decide what do to. invest or not.
well some gambling don't need to be lucky because sometimes we just need strategy and knowledge for us to win in gambling. And the gambling experts always win in the game, because they are professionals, and they always doing this to gain profit.
I know that kind of games, that is when you use your skills rather than luck like poker and the likes, it is really important that you have the skills in that kind of game so you can take advantage against your opponent but luck help you increase your chances.