The seven deadly sins are based on: Pride, Greed, Wrath, Envy, Gluttony, Lust, and Sloth.
It has come to my intention that gambling is related to the SDS. Not all of them, but I believe Pride, Greed, Wrath, Sloth are what makes of a gambler.
Pride: The will of not losing. The gambler always strives not to lose as he always wants to win not matter the cost. He would throw his life, fortune, even his beloved ones for the sake of money. ( I am talking about a very addictive gambler.)
Greed: A gambler always wants to gain money even if he is already rich. Why buy two houses if you can buy one? Why do you need more much money when you already are living a good life?
Wrath: A gambler will not be able to control his emotions when he loses which will be the result of releasing his anger on people around him or even hurt himself.
Sloth: A gambler wants easy money, easy life, easy things. He does not make efforts to gain money. That is why he resorts to gambling because he can get two birds with one stone; money and fun.
The mentioned above are within the human nature. It is a challenge for yourself whether you are able to control them or let them take over yourself. It is up to you to decide.
I bet that you got this idea on the Anime "The Seven Deadly Sins" which is really connected in gambling. What you have said was true, this seven behavior of all of us is so hard to manage whenever we trigger it. Mostly when we are playin gambling, all of this sins are provoking us to gamble even more, to believe that we could win in gambling if we are going to continue, thought the truth is not.