Arrrrr me mateys! Just keep rationalizing your actions! Just because YOU think YOU are entitled to something YOU think it's right!
You might not be using MORE bandwith at any given moment while tethered, but you might use it more frequently, surf the internet for longer periods on your laptop than physically on your iPhone. In the end you use more data, and AT&T reserves the right to charge more (tethering fee, it sucks, don't get me wrong, but that's the standard...for now) if you use it for more (yes I know unlimited is unlimited...) and not from just your iPhone. It's business ethics, not your ethics.
You might not be using MORE bandwith at any given moment while tethered, but you might use it more frequently, surf the internet for longer periods on your laptop than physically on your iPhone. In the end you use more data, and AT&T reserves the right to charge more (tethering fee, it sucks, don't get me wrong, but that's the standard...for now) if you use it for more (yes I know unlimited is unlimited...) and not from just your iPhone. It's business ethics, not your ethics.