Interesting quandary. As a loose analogy, isn't this roughly equivalent to what commercial banks do? They hold the funds, then use that value to generate additional value?
But you don't pay a bank to hold your money do you? imagine paying a bank 1.2% a year to hold on to your cash? infact the obverse is true, banks pay you so you deposit funds with them, therefore they use those funds to generate profit to pay your interest.
apples and orangutans here man