Moderation? Or Free-for-All?

What is your opinion on this parenting debate? I'm of the camp that allows my children to have things in moderation, hoping to thwart their desire to eat sweets until they're sick. I've even used this in my own life, while doing Weight Watchers. If I allow (and make note of it, of course) myself to have one cookie/cake/whateversoundsgoodatthemoment, I don't have the desire to eat the whole cookie jar of cookies.

I'm hoping the Princesses will follow through with this moderation when it comes to their finances. I'm trying to teach them that credit cards shouldn't be thought of as "free" money, because, we all know, it's far from free! Wish me luck!