What would it hurt to add 1 or 2 tandem breakers in a 200 amp 40 circuit panel. There's plenty of room for neutrals and grounds. It won't overload the buss, it would be perfectly code acceptable to put 1 or even 2 or 3 - 100 amp sub panel off the same buss, so what does it hurt to squeeze in one more circuit rather than forcing a customer to pay for a sub panel? Don't just point out code referrences that disallow it, but the real harm it could cause. Thanks.
