Random idea that just came to me – require regranters to put down a “deposit” (say, $2,000 if their budget is $100,000), which they only get back once they’ve donated at least 50% of their budget. Not only would this create an incentive for them to actually regrant, but it would also make them think a bit harder before accepting to be a regranter about whether they were actually committed. (OTOH, I can also think of negative aspects of this setup.)
Random idea that just came to me – require regranters to put down a “deposit” (say, $2,000 if their budget is $100,000), which they only get back once they’ve donated at least 50% of their budget. Not only would this create an incentive for them to actually regrant, but it would also make them think a bit harder before accepting to be a regranter about whether they were actually committed. (OTOH, I can also think of negative aspects of this setup.)