ROI discussion was: Bitmain's Released Antminer S9, World's First 16nm Miner Ready to Order
...[blibityblablabla]....
Yay you, you managed to catch me in a semantic misstep while doing 14 things (one of which is earning revenue [and an income] from my S9s)! Do you feel like an adult now? 
Edit: For the record, Joe Schlockrock running 1 or 2 miners in his Mommy's garage has no reportable difference between income and revenue and no justifiable cause to depreciate a still running S9.
Sorry, I cannot let this go. You are spreading incorrect and stupid information to people. joe schlockrock DOES have difference between Revenue and Income even if he is running them in his mommy's garage. he should be taking REVENUE (the rewards he receives each month) and SUBTRACTING from that revenue his EXPENSES (if he steals the electricity from his mommy, he cannot expense it and that is stupid but he still would have other expenses the largest of which would be DEPRECIATION.
To think that "no justifiable cause to depreciate a still running S9" is INSANE. IF (and I mean IF) an accountant told you that, he is a fool and you should report him. You think a cab company does not depreciate the cars because they are still on the road?
WHAT???
That is insane. You know there is special depreciation available also to fully expense these in year 1? Even if you do not want to do that, you still could do 1/3 of the cost each year.
You are giving people very bad advice serving it with an attitude. Stop.