"I don't cost anything"

After a morning of running several errands and the kids were ready to be home, I explained I just need to drop of some money to the nice ward member who fixed out breaks on the van. Maddie replied, "you have to pay for that?" I went on to explain everything cost money. After listening for a minute, Maddie replied, "I don't cost anything." In my mind I thought now this is going to be fun. From there I told her about paying the doctor, the hospital, her clothes, her formula, her toys, her crib, then onto her ballet, her gymnastics, her Summer camps, etc. She didn't have anything to say after that.