Prepaid Cards

I like the idea of prepaid cards so that if I get one, I can buy whatever it is that I want. However, there is a trend for having a prepaid card for teenagers. Part of me doesn't like it because they can buy whatever it is that they want. But on the other hand, it seems a little more secure than cash. And better options for them to buy what they want versus just a gift certificate from a store. I guess with everything, it's about having conversations with your children and putting parameters around it. Geez. Whatever happened to kids wanting to just hang out on the porch with a slurpee in hand?