please put some links with the latest hardware and let's make some calculations after that
it seems new : http://www.spondoolies-tech.com/products/holiday-special-sp20-mini-farm-batch-2
you can earn up to 2 USD per DAY Smiley
Hardware cost = 5500 USD
Electricity = aprox 10 cents per hour
Based on current difficulty you would earn roughly 0.2002 BTC per day assuming you have 100% luck. Based on a $250 price of bitcoin that works out to $50.05 per day of revenue. If you were to assume the price of bitcoin is $200 (where is was only a few days ago) then you would earn only $40.04 per day which although is above the cost of electricity, it does not give very much room for error.
BF4500
Cost : around 10,000 USD
Specifications 4.5TH/s
3000W
you can earn up to 15 USD per day without electricity cost.
Please correct me if I am wrong.
The gross revenue would be closer to $10.72 assuming a price of $250 and closer to $8.58 assuming a price of bitcoin at $200. In order to realize $15 of gross revenue you would need to assume the price of bitcoin is ~$350.
Based on 3 Kw per hour of use of this device, you would use 72 KwH per day which works out to $6.48 based on $0.09 per KwH.
I am not sure what your point is. The SP20 is an older model miner
alright, and what's wrong with what I said? let's say 10 USD per day = revenue ...OK, I m generous and I am saying 20 USD per day. How much does it cost the hardware? How long does it take to recover the investment?
The hardware must be changed yearly or even earlier than that. Another hardware = other money. So, how is it possible to mine these days?