15% isn't a negligible amount.
2% is a negligible amount, and even then it still hurts.
Take away 15% of your household budget. See what I mean?
Speaking as an employee of a non-profit, I feel safe in saying that every penny is probably spoken for. Also, for every penny taken away, that's another penny that has to be found elsewhere, probably by assigning new tasks to an already existing employee. (If your funding is cut, you are not going to go out and hire a development person.) Unless that person is underemployed, this means overburdened staff. Not a good way to do business, but better than no business at all.