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They were only really profitable (for miners, not the manufacturer lol) if you got them early enough and cheap enough. As for me, I barely made enough to cover my costs by the time they became practically useless because of the very small return they soon provided.

That's what I thought. If you subtract power cost for running your computer all day, you will certainly behave lost money. But the experience was worth it I guess xD

Experience is worth it if you contemplate the experience, and crystallize it within your being.