In this article I explain WHY you should wait on buying it, and also, I did a TON of math to prove why you should wait. All of my work is here, and is accurate, feel free to double check yourself:
https://thebtcpool.com/bitmains-s5-in-revenue/ A quote from your link:
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That is a pretty long time to get ROI, but now, lets see what happen when Bitcoin is valued at $180.
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Per Day:
At $0.05 kW/h = $4.20
At $0.08 kW/h = $6.72
At $0.12 kW/h = $10.08
Per Month
At $0.05 kW/h = $130.2
At $0.08 kW/h = $208.32
At $0.12 kW/h = $312.48
Now, lets look at revenue, mining in a pool:
Per Day: $13.40 (0.0744 BTC)
Per Month: $407.81 (2.266 BTC)
Time to add these together to look at your profits:
Per Day ($0.05 kW/h): $13.40 – $4.20 = $9.20 – Profit
Per Day ($0.08 kW/h): $13.40 – $6.72 = $6.68 – Profit
Per Day ($0.12 kW/h): $13.40- $10.08 = $3.32 – Profit
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Per Month ($0.05 kW/h): $407.81 – $130.2 = $277.61 – Profit
Per Month ($0.08 kW/h): $407.81 – $208.32 = $199.49- Profit
Per Month ($0.12 kW/h): $407.81 – $312.48 = $95.33- Profit
Let’s not forget to add in the cost of the power supplies = $465
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Total Price Of Equipment = $2,815 USD
Price To Pay Off Equipment And Be In Green:
At $0.05 kW/h = 10 Months, 1 Week
At $0.08 kW/h = 1 Year, 2 Months
At $0.12 kW/h = 2 Years, 5 Months
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Well how about this lets see what happens if you have the psu's cost is about 2450 with shipping
And while we are at it lets see what happens when btc is 400 a coin
BTW they are no longer for sale