Catch yourself, two points should be added:
1) In a case where the rebbe could find a different source of income, the reason of schar batalah would not apply, but R’ Moshe still assers because he’s causing bittul Torah.
2) The concept of eis la’asos could be used under limited circumstances to allow a brief stoppage, if it will result in a long term benefit, meaning it will spur the board to raise the required funds to prevent the rebbeim from leaving altogether. R’ Moshe considers this option to only apply in dire circumstances and with great consideration.