I've been asked to "click for a mammogram." Is this a good idea?

The “click for a mammogram” website is offered by The Breast Cancer Site which, in turn, offers advertising plans to their sponsors. This is an American site and, according to our sister organization, Breast Cancer Action of San Francisco, it takes over 18,000 clicks to pay for one mammogram. The money generated from the advertisers is sent to the National Breast Cancer Foundation in the U.S. The NBCF, in turn, grants money through designated programs. Whether these programs actually fund mammograms is not disclosed.

The problem with any campaign to increase detection of breast cancer is what then? What if an American woman who cannot afford a mammogram (presumably because of a lack of medical insurance) is diagnosed with breast cancer? Who will pay for her treatment?