You used to be able to just call people. You didn't have to be on someone's calendar to have a phone conversation. The telephone was an important and valuable domain of communication, both for casual, friendly chats and for professional exchanges of ideas and information. But no more.
It's time to stop obsessing about overhead and start focusing on progress. Change charity, and charity can change the world.
Our generation does not want its epitaph to read, 'We kept charity overhead low.' We want it to read that we changed the world.