I won't pay the kids to do what I consider to be their contribution to the family, and have always made this clear, cos if you live in this house, you contribute (DD is 12). I will however dock pocket money if I have to repeatedly ask her to feed the poor cat etc.
She can earn extra by doing stuff like weeding the front garden, or washing the car as she is always looking to fund a trip to the movies.
DD can spend her money as she likes, but she is getting smarter by taking lunch to school instead of buying it - just like i had hoped!