Because money is exchange people use to trade skills.
Because mishandling money is sometimes the root of divorce, and you learn the hard way why you should know what money does.
You are being trained how to use money properly when you use your teen years and preteen years as study time. Think of learning how to use money as an extra course for extra credit.
People often say "What should I take this math stuff. I'll never use it." People never say that about money. You don't like your allowance? Fine give it away and see how you feel.
