Hmm that is an interesting way of looking at it. I was fooled by Nicehash's sales calculator tbh, and its 48 day month and was expecting the card to pay for itself in 3-4 months, then I'd buy another and keep going.
Even with your approach its hard to justify spending lots on GPUs for a pound a day when an S9 can do 10-20 times that for the price of 3 used 980s.
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