I have some insight into this and it's not good. Quite a while back I supported a charitable drive for a good cause on a well known site (you'll have heard of i

I have some insight into this and it's not good. Quite a while back I supported a charitable drive for a good cause on a well known site (you'll have heard of it). So, total donations were by about 20 people who really funded all of it, the total take for that was distinctly under £1000. At the time that site had between 2 and 4 million views a month. tl;dr few people will consider paying, far fewer will actually pay, even when it benefits them in the long term. What really upset me about that is if everyone who looked at that charitable request and had simply coughed up £1, and most of them could (sometimes you can't; I've been in that position so I understand) a real difference could have been made. If a charitable health-based cause pulls in so little cash, even fewer people will donate just to keep a site running.