ROI discussion was: Bitmain's Released Antminer S9, World's First 16nm Miner Ready to Order
...you need to get the original investment back before you are getting a return on your investment....
Because it's moot and off-topic, I'll leave you to your misconceptions and trust the definition used by my accountants (and the IRS, to whom both they and I answer to when it comes to such topics) over random uneducated strangers on the interweb. 