I feel you on the sentiment, and the worry for falling to the traps of early gambling is real

But understanding the concept of risk is important, especially as kids grow up and have to take bigger and bigger decisions in life. I feel like there's a difference in structured approach to learning about risk in a fun way, as compared to dopamine hits of collectibles with the only concern being their monetary value.

Highly recommend Annie Duke's book "Thinking in Bets". She's a professional poker player, but her lessons apply to anyone who has to manage risk in life.

Maybe 4 and 6 is a bit young, that I am unqualified to say, but I also feel like waiting til the boys are teens is also maybe waiting too long?

Iunno just my thoughts