You're right, it uses less voltage to achieve a high overclock - but that doesn't negate it running at a higher temperature. I don't know why you're thinking I'm bending laws of physics. If one chip runs at 60c for an hour and another 80c during the same time and task...which one is going to heat up the room more? The 3770k running with less volts but a higher sustained temperature, no?
That's my major concern, the space heater effect over time.