I have seen good answers and bad answers to these questions when I tried to dig a little deeper on MFIs. But mostly... no answers.
This is exactly why I think using the already budgeted interest could speed this up, and work to everybody's advantage.
If the MFI credits us the interest they would pay the bank, give kiva 2%, subtract inflation and then give us the option of
1) taking whats left.
2) applying it to the principle on the loan.
3) applying it toward MFI run education programs.
these decisions being made before the loan was distributed, the recipient would simple be told they were awarded a better rate if the loaners chose option 2, otherwise they would get what the same thing they already agreed to, no loss either way.
This gives loaners personal say in how to distribute the profit from their "free" money, and have a direct impact. This seems more practical to me then waiting for the MFI's to each come up with a plan of their own, and then having loaners pick MFIs based on which reinvestment plans they like.