Dumb charities

So we donated to the breast cancer research program, and then they are calling non-stop just to say "thank you". Then they turn around and call about wanting donations for the Children's Cancer Fund of America. I'm all for helping out and making donation, but this is ridiculous. We were getting 15-20 calls a day from these people, so I wonder just how much of my donation actually goes to research and not paying these telemarketers???