If you have a system where the developer isn't allowed to charge money because the people it could help are poor, you are setting up a system where the develope

If you have a system where the developer isn't allowed to charge money because the people it could help are poor, you are setting up a system where the developers will only work on diseases of the rich. You could say "well, they should have just done this one for free," but there's no more reason for them to it than for you. In fact, there are charities which go through all the funding of researching drugs for the poor. The Bill And Melinda Gates Foundation has paid for drug companies to get drugs approved, with the contract saying that they will be available at low cost once everything is done.