This is a tough one, I don't like it, even many of them might not like it, but if they gain from it isn't their first priority to raise the funds needed to provide for those in need? I think I would have less scruples about doing such a thing if I were exposed to the end suffering, which I'm not.
Of course, I also think it could easily be a slippery slope and despite my above observations trying to play devil's advocate, I think it would cause me to cancel, at least in the short term as to make my feelings on the matter very clear. I sympathize with the needs of certain charities but there is a limit. All hypothetical for me though as I don't have a regular donation set up with anyone.