You have to measure ROI in both dollars AND Bitcoin. Electricity is sold in dollars, not bitcoin. And regardless of whether you paid $5/btc a year ago, what you PAID then isn't what matters, it's what it's worth now.
Whether you have Bitcoin or cash, it doesn't matter. Either way, you're looking at $6000, because if you cashed out that bitcoin, instead of spending it, that's how much money you would have. Hence, you're losing $5750 in value that your cheap $5 Bitcoins that you spent $250 for are now worth.
At the end of the day, it doesn't matter when you bought in. The Blade will cost you $6000 in assets.
I think ROI needs to just be BTC. If you can get your coins back, electricity should be pretty trivial on a 90w item.
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