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Yes, technically you are right ... however, when most people here are talking about "ROI", they actually mean "interest" in a way to increase their number of owned STEEM.
I wonder if in future I should replace "ROI" by "interest" or just describe in other words what I mean?

I note a dichotomy between the effect of profiteering and investing for capital gains on the underlying investment vehicle, and those are the terms I use. The former extracts the value of the business, and the latter is intended to increase the value of the investment vehicle, in our case Steem, creating capital gains.

Both methods create ROI, but the former destroys businesses, and the latter builds them. Throughout history examples of both methods demonstrate these effects, and the latter proves far more productive of ROI over time. This is why Warren Buffet is far more wealthy than Mitt Romney. Buffet builds businesses and causes the value of the companies to increase, while Romney sells the assets of the companies for profit, destroying them in the process.