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.
People who set targets for themselves in my opinion end up failing because gambling isn't something that has a sure outcome, setting a target means that you are sure of getting the profit from it. Nothing is guaranteed, this is the reason why I always hope to get lucky no matter how long I spend doing my analysis. One thing that most gamblers and bettors need to know is there are certain things that can change the outcome of our predictions