Spreadie
How is it a viable business model if a largely autonomous single purpose device makes more money than it costs to buy? Surely you'd just mine with them instead of selling?
By that mentality, Nvidia should stop selling GPUs and just do inhouse mining.
It's the same thing as always, the tools you manufacture can always be used to make more than you do using them than you selling them. But then everyone needs the tool so therefore you make bank on that fact not the more fluffy post sale one.
Think of it like a farming equipment manufacturer, it costs buttons for the shovels, hoes and tools to plow and farm a land and will after a single harvest make more than the tools were purchased for. But they still needed the tool so that's where Bitmain is sitting.
I also bet they have some of these running making them money as well anyway.