To follow up on this, as Graham and Keith have said the only reason for making it a charity is to ensure that the maximum contributions go in to developing things for RISC OS and not anything else.
To pick up other points then yes some people would not be interested in a "bounty" but they might need some money to purchase items to assist in the devlopment i.e like C++ tools, RISCPC if they haven't got one. It might mean the "Charity" has some items to loan out to assist things or as stated people help by doing testing/documentation/graphic designs etc. I wouldn't rule out derisking a commercial product as part of the assistance so that the product gets developed when it might not have.
Things are in the early phase and people joining the mailing list now have a chance to influence what goes on. So instead of saying RISC OS is dead because it has got xxx , why not come and try and do something about it