10-20 dollar children's toy ASIC doesn't consume 1200W electricity. If you are going to use them as heaters, you need a ton of ASIC in there.
Exactly, and more asics = more hashing power = more payback. That 10-20 dollar toy cost is mainly due to marketing, distribution, and profits.... not for the "expensive" asic inside.
I'm going to leave off this conversation here as we will let history be the decider.