The price of babysitting

This morning I took C back to the doctor (for a lingering ear infection).  As we sat in the sick child waiting area, a little girl came over and asked if she could play with C.  Her mom and grandma were in the well-child waiting area, and didn't seem to mind (!), so I said yes.  Then I basically babysat her for an hour.  She was very sweet and well-meaning, but she kept wanting to pick C up even after I asked her not to.  C was getting visibly upset.  The cost of an hour of babysitting?  Apparently no more than a co-pay.