People always seem to think that charities pay huge wages. My DD works for a local homeless charity. She is low paid, as are the handful of other workers. Their wages come from grants, not from public donations. They work long hours dealing with people who, in many cases, the rest of society wouldn't touch with a barge pole.
Their only regular donations come from local businesses but they have some wonderful supporters who never fail to rally round if they have to ask on Facebook for extra donations, often when they have an entire family to support through a crisis. Without their support, the charity would fold.
As for TV appeals, I don't feel irritated. I feel pity and a sense of guilt because I can't afford to give to many of them. Years ago, I did have to tell the NSPCC that I had to cancel my direct debit to them because I had been made redundant. They wrote me a nice letter, thanking me for my past support, and never hassled me. I know that some charities phone people about their donations but the NSPCC never did.