That is why this stuff called gambling, nothing certain and predictable here.
And what makes gambling fun is indeed because of trying to make a prediction on something that uncertain .
There is no fun in that and seriously if you want to have some fun then you should bet and win it. If you keep losing then you wont feel any fun at all. Some people miht not be honest with this however when they gamble all they want is just one thing, which is to win and no one wants to gamble and lose away all his money when you keep losing however thats probably why most people cant stop gambling at all