My 2 cents:
I personally feel there is nothing wrong in showing them how to make money from affiliate marketing. When you give them tips/secrets etc… ask them to try out a different gambling sector from the casino side (such as poker/sports betting) and tell them the reason why.
This will stop them copying your content and also help them become good at it. I did just this with a good friend of mine, and now he earns a nice sum promoting health insurance (totally unrelated to gaming).