I think the idea is to show that worthwhile things can be done with what seems like a small amount of money, otherwise potential donors may feel that their $10

I think the idea is to show that worthwhile things can be done with what seems like a small amount of money, otherwise potential donors may feel that their $10 can't make a measurable difference to a real person's outcome and will be less inclined to donate. Ringfencing money like that would be very inefficient unless you can perfectly balance supply/demand beforehand. What happens if a ton of donors donate goats but then you find that nobody needs the goats anymore but you could really use the money for something boring like employment liability insurance?