There is absolutely nothing wrong with a -EV player (losing player) going home with a profit. As a matter of fact you should do so EVERY chance you get. if you put a dollar in a machine and win your first spin, resulting in $1.25....you SHOULD get up and go home. Because every spin you take further it becomes more likely you will lose. Not trying to be nasty....those are just the hard cold facts.
Now for a +EV player the exact opposite is true. Every spin he takes it becomes more likely he will win, so he should keep playing as long as he is playing at an advantage.