Do you know what kind of situation gambling addicts are in? Do you know the sort of debt they pile up? Do you know the consequences of not paying your debt to a loan shark?
People who play Magic The Gathering buy products. Buying products isn't gambling. You are not buying a product when you go into a casino with 1000$ and go out with 0.
You have zero clue what you are talking about. You can sell TCG cards, often for a higher price than you spend on them. End of discussion. Deny this and you are just being ridiculous.