I can't even recall the last time I set a target for gambling – I mean funding my balance with X amount and expecting to make XY amount before the end of a given period. That makes gambling more fun to some point, but it also puts a lot of pressure on me to be much more calculative. Even when, in the end, I, as the player, can't guarantee the outcome of all my games, I still will put that pressure on myself, which makes it more fun and, at the same time, painful when you lose such a bet.
There's this
thread I was just telling someone how this can go, there are some gamblers that set unrealistic target, knowing fully well it's gambling and nothing is guaranteed, they still set unrealistic target which can caused them to lose more than expected. Setting target is good but knowing that nothing is guaranteed in gambling is also very important so that when you see that you have tried your luck 2 or more times and you target is not met, you will have to stop.