How much of your income should go towards your child’s extra curricular (e.g. figure skating lessons)?

As much as you want and can afford. I don’t mean to sound glib, but I don’t think it’s any of my business to tell people how to spend their money. My thing is that people have a balanced financial life, covering all the bases, and not going into debt for crap. If you want to spend all the extra money that available on your child’s extracurricular activities, have a blast.