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it all comes down to cost of new mining hardware and electricity, justifying against speculation of mining difficulty and btc price
mining GPUs selling out like hotcakes, you won't find much of used ones selling cheaper than retail unless you get lucky (if there's huge bitcoin crush and everyone rushes to sell their GPUs then it will depreciate significantly)
internet you already paying for, not much BW used
processing cycles are not lost in dedicated mining rigs, I run miners on my workstation and it didn't slow down my PC one bit, can even watch netflix while mining without quality loss
unless you pull processing cycles from already intence tasks such as video rendering/3modeling, it is not an issue
labor cost depends how organized, optimized and crafty you're, yes there is a learning curve, ones you setup everything you just have to keep an eye on it with occasional downtime for maintenance/repairs. people running dozens of rigs - they may spend more time in labor, but they are making it their business not a hobby
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