But practically stopping just after winning is not at all possible for any gambler due to the fact of greedy. Controlling our emotions when we do see profits flowing to us is extremely hard. Instead of stopping at that point, usually people go for doubling their bet amount. This is the reason gambling is wrong in many people's perspective.
If you can't control yourself and let addiction or emotion take over your mind, then of course gambling is unfavorable experience and can go in wrong direction.
Logical calculation and clear rules set for your gambling session can help you keep your head cold.