I think that after gambling for some time you somehow become "skilled" at knowing when to stop. You develop a feel about it like a 6th sense that tells you: "stop now you idiot". I dont want to call it skill tho, but it's something strange. It doesn't mean you will win more, just lose less.
It's kind of hard to do if you don't have discipline in yourself. You should stop when you're earning some profit and starting losing and you should also stop when you're losing a lot. It's not a skill, it's not something strange. It's called "common sense."
