What to do with a Child who plays SNG's?

[Freudian]

I think it is ok provided that:

a) You know the password to the account and he doesn't.
b) You sit behind him when he plays and talk to him, trying to teach him about risk/reward, probability. I think a nine year old can grasp these things.
c) You block the chat if possible.

But if you treat it as a babysitter, I think it is a horrible idea.