Thanks for these recent replies as they highlight a benefit that I had not considered. It seems that not only are the electricity costs a factor but the noise and heat pose significant discomfort to the miners. We would strive for a passive heat sink (no noise) but the 60W estimate for the high-end product may require a fan. We'll see.
This, is what we call spinning.
PS: Nobody gives a freaking shit as to how you're to cool your 60w mythical device.