I was just going to give these to people who where interested... but.. meh.
I think this has something to do with asking an amount (4700$) that your miner will never produce under current market prices.
10.30
BTC in a year until crazy difficulty = ~4400 $ --> Net loss 300 $ + shipping and whatnot.
https://cex.io/calcGood luck.
The problem with that calculator is it doesnt factor electricity. Pushing about 1900 watts to power that thing it would be lucky to make back $2000 in its lifetime. Meaning about 49 Billion difficulty it mines almost zero after electric.