An Australian company, Bitcoin Group, recently tried to list on the ASX. The IPO has stalled but the "Independent Expert Report" relating to the listing is interesting as it gives a glimpse into the problems facing large scale miners without access to 14/16nm machines.
The Bitcoin Group ran about 6 Petahash until March 2016, mainly in China. It appears at least half of this is now being turned off as it was under agreements expiring in March 2016.
The Bitcoin Group aimed to use the money raised in the IPO to buy 3,252 Antminer S7s, partly to replace older hardware. This would have given the Bitcoin Group about 15 Petahash.
Details of the the "Independent Expert Report" are at
http://www.asx.com.au/asxpdf/20160307/pdf/435nf0ck82zfbz.pdfInteresting points are:
1) The Chinese electricity price from the mining hosting company was 0.41 CNY/kWh. This is 6 cents USD per kWh. This probably included all hosting costs as hosting costs are not mentioned elsewhere.
2) The installed price for 3,252 S7s was $1,208 AUD per unit, or around $890 USD. This seems high, even assuming it includes the cost of a power supply and initial setup. There are obviously no big discounts, even for orders of that size.
3) Pool fee cost is 2.5% of revenue
4) The independent expert reported that the Antiminer S7 would lose money, and show a net negative return, under the examined scenarios.