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Many quotes
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Some people can afford to mine at a loss, and that makes it a profitable business
This doesn't make it a profitable business, this is what's making competitive business. The home miner game is still alive, people know that renting mine power from a service like hashnest could cost them less than maintaining their own, yet they trust their own hardware more.
I personally know people that mine at home 24/7 with not more than a single Th/s. They know that electricity might be costing them more but are betting on a price increase.
I will admit that I do this, I like my two s3's supporting the network, even if my electricity cost and mining profits almost zero out each other. I never will ROI, unless I sell my gear. But I enjoy making some coin here and there. And I can always diagnose my problems on the spot incase something happens.