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!