I think on gambling the most important thing is to control the emotion of a gambler and to do that the person must have to be able to self control, money management, decision maker (who can decide anything which s/he wants and the more important thing is that his control on gambling by not be too greedy and at the same time try not to recover at the time of loss.
Self control is just something else that we talk about almost all the time but not all gamblers take that very seriously as it appears hard for them to follow, I’m happy to see that in your last statement you said “don’t be too greedy” which show acknowledging that gamblers are always greedy in nature it’s just a matter of how much you can control that greed.
You know people aren't that careful with the word self-control, greed, and also addiction.
These words are seen as a common statement or sentence we often used here without implementation, and of course there should be some set of limitations and discipline while gambling, whenever they stick to discipline you would see that it would be hard we hear anything about addiction as more gamblers could be that careful not to become addicted.