Agree to that, even a small chances of winning as long as you deal with it using your knowledge and skills there's a chance that it will happen, you just need to work with it and keep your focus, discipline and allowing yourself to enhance your knowledge from the experience that you gain in each gambling that you made, more on taking time and expanding and exploring with every opportunity that you may have.
There shouldn't be risks taking without careful analysis and knowledge of the indebt effect of that risk, this is very important to all to at least make our plans not to go beyond how far their can bear in terms of the risk, and if a gambler gamble with that line of thoughts, he will definitely be above every trouble waters that can come along with the risks and ending up with some great rewards in the end.
I am in agreement with all that you have said, Risk, or risk level is very important in every thing that we do that involves taking risks, I choose to say "risk level" because risk comes in different levels, and it's our respective job to find out the level of risk we can comfortably take per time depending on how much money we have and whether or not it's money we can afford to lose.
Putting a risk level into proper calculation and making sure we stay at a level that does not throw us off balance financially when things fail to go as planned is one of the ways to indeed stay guided as a gambler, and we a better chance of making big money off gambling than losing big money in that process.