ROI discussion was: Bitmain's Released Antminer S9, World's First 16nm Miner Ready to Order

...and I'm also not here to argue semantics...

It's more than an issue of semantics. When you misuse a financial word, you spread dis/misinformation. If you spend $1,000,000,000 on an investment and you only get back 1¢, then you have an ROI of 1¢. In such a case, $1,000,000,000.01 is an ROI of $1,000,000,000.01 not an ROI of 1¢.

Because, words matter!

I didn't misuse the word Return on Investment. Return on investment is a measure of the gain or loss generated on an investment relative to the amount of money invested. When people say they've "hit ROI" - which they commonly do - it often means they've recuperated 100% of the amount of money they have invested. Antminer L3's "hit ROI" or "break even" in ~45 days.

CG: You are incorrect. GMP is correct. You are thinking more about an asset investment where the asset retains the original capital value.
In the case of miners, they have little value (unless someone on here would like to buy the pallets of Avalons/KNCs/CoinTerras/Spons that we have gathering dust) so you need to get the original investment back before you are getting a return on your investment.
This equipment depreciates quickly and that has to be subtracted from your income until fully depreciated.
This is not worth arguing with people over and you should let people be when you know what they mean. It just makes you appear petty especially when you are incorrect.