I once had the intentions of doing the same thing, which was starting my own enterprise as a non-profit organization, and going around from place to place, depositing equipment at hospitals for children to do well during their time while in recovery at hospitals, enduring chemotherapy, replacement organs, or severe burns or trauma. The ideology behind this is a blessed one. Valve piloting a project that removes crap from their servers, while at the same time, offering new programming, (or old), back to the consumer basis is a unique way of working within the confines of charity to better not only the gaming industry, but the community at large in hospital systems where children doing nothing more than watching television, or wishing there were something cooler to do, have that unique opportunity to do so.
Make a Wish Foundation can only do so much, as could any single philanthropist. But when people, especially developers, and consumers alike propagate funding to charities that offer better things for these kids, well, it's nothing short of an extended miracle that continues to give, and any individual that things something better should be done, doesn't remember that medicine, especially pediatric medicine has always been trial and error, starts with cadavers and test subjects, and is seldom frustration free.
+1 for Valve, +1 for the charity work, and to anyone who can look past a paltry expense for future escrow, a little common sense on top of it all