most of the pints that you have listed are very valid, but i feel that there is meeting that is missing which is greed, or is greed not also a bad habit that usually cost gamblers a whole lot in gambling?
I think that its even the most dangerous habit and that is probably what the OP meant by his fourth point. You can never mention deadly habit in gambling without adding this to the list even though majority of gamblers are guilty of this.
Greed is also mistaken for aiming high or dreaming big but realistically it is not good at all and as players, its better to settle this habit before even coming into gambling. Anyone that is greedy will definitely have problems in gambling because gambling on its own has a way of making responsible people become greedy and it takes discipline to overcome this and then it becomes even more difficult for those who are by default naturally greedy.
Greed is a human nature and we really can't avoid it. If someone is winning, he wants more of it. The contentment is nowhere to be seen in this scenario. I guess we are all guilty of that at some point in our lives. And we need a good learning experience before we can say to ourselves that we already have had enough.
But such greediness is fine with me as long as you are using your own money and not a borrowed one. If you are already loaning your money just to gamble, then that situation is already different.