Why?

Why do I put in so much effort? Why is this not enough? Why do I have to explain to a parent that their child can't cook something because they didn't show me their recipe during the week and they instead have to cook something from the recipe book that they were given? Why do I have to put up with them complaining that the recipes I provided are a waste of ingredients? Why would they let their child cook muffins that they knew they didn't like the taste of? Why do I bother?