At the end of the day, it all comes down to ROI. If this had a good ROI, it probably already attracted enough investors without needing to create such a investment product. If not, then I might as well buy SP500.
Joking aside, why would that be? They're creating an investment vehicle that pays 7% return subject to various conditions and taking some cut for themselves. You can't just assume that all investments are already fully sold on the market and no one can create new ones.