If you will include the ponzi scheme then those kinds of investment has the highest ROI in just a short period of time. There were too many ponzi investment scheme here in our local and one of it was being shut down by the government after the president had caught their attention on investment scheme to which it offers huge ROI in just for three months.
Now, the investors are trying to get their money back because the investment scheme had seem not profitable after the government shuns shutdown on the Ponzi investment scheme.
They shouldn't be included as they are scams.
IEO is the best investment have higher profit or ROI, but you have know before which one the best IEO to get much profit before you buy or invest, always choose the best exchange market to buy an IEO coins.
So far they are because it's on their peak but what will happen if most of the investors find another avenue of investment that has a better hype than IEOs?