Waste not and want not are words to live by. This is a great concept. Although I might have questions about which coins are truly feasible with this kind of a rig. But the industry is definitely moving in the right direction.
Just an after thought. Proof-of-work seems to be giving way to proof-of-stake and delegated-proof-of-stake. While this saves money overall by reducing energy, it often requires more powerful systems. So you have fewer systems overall, but gone are the days when you can effectively mine the more popular coins with your home computer.
But, things will continue to change and who knows, we may all be mining from our homes at some point in the future.
