I've been mining for a little over a year with my first S9 arriving in Jan 2017.

During this past year, no matter the price, it never dipped below an equivalent of $15 per machine per day.  The last two months, however, the difficulty nearly doubled and daily profits have dipped down to around $8-9. 

I'm considering expanding into a warehouse, as I live in an area with relatively cheap electricity available in the countryside and can maybe get ahead of the game ... but is it worth it?  BITMAIN and others have very large facilities of 300,000+ S9s;  I called the electric company and BITMAIN is paying around 4.3c kW/h.  The public electric company has a moratorium on any new mining farms and are, likely, going to increase the upfront costs.  I was pointed to this document from WA: http://www.chelanpud.org/docs/default-source/default-document-library/bitcoin_information_final.pdf

I know there are some people who were around in 2014 when the new miners weren't being delivered and price was so low people were turning off their miners.  Can anybody tell me what that was like? Has the profit ever been this low?  I'd appreciate any insights.

Best.