Does the contract have to be fair to be valid regarding to this case?

You are a ski instructor at a resort near Whistler. After failing to make the last Winter Olympics, you got stuck teaching beginners at the local ski school. You are very bitter and charge high you defrauded him. You maintain the contract is completely valid and binding because the law doesn't protect stupid consumers. Besides, you didn't hold a gun toprices for your lessons, taking advantage rich kids who are first-time skiers by claiming they need several lessons before they can safely ski at Whistler. You make them sign contracts for packages of four lessons when they actually learn everything they need to know in one or two. You are now being hassled by a customer that you taught during spring break with a claim that anyone's head and force them to sign up for lessons. Frankly, you think the contract was valid and the customer was just too dumb to research and find out it was a bad deal.