What if there were a way for a lot of people to add a little bit to the bounty? What if anyone could use paypal or something like that to add a dollar or five or ten to the bounty? Collectively, this might be minimally valuable to a few people, but if a lot of people added just a little to the pot, the pot could get very enticing. No need for the honor system, just create a 'product' on paypal to put the donation to. Have it expire so that people get refunded if there are no takers after so much time has expired. Perhaps I do not have a handle on how these things work, but it seems to be something worth exploring. As more people come across the idea that there is a pot for someone to deliver something valuable, they might feel better about adding a few dollars to the pot, knowing they will get it back if it is not delivered.
just a thought