We are referring to static ROI looking at the difficulty change possibilities. Since we cannot predict the change in difficulty level we are mentioning only the ROI as per present day condition. Also long term plans can easily achieve 200-300% ROI.
A 1080 days BTC mining plan at $89.99 can easily achieve static roi based on present day profitability of 264%.
Unfortunately, I find your project very suspect for one reason. You claim the ROI is static and will be over 200%. Can you explain to me how the ROI can be static if, for example, the price of Bitcoin (or another mined cryptocurrency) goes into the bear market for a year? After all, something like this could happen.