This is exactly the same argument that Bill Gates used in 1976 in "Open Letter to Hobbyists", asking: "Who can afford to do professional work for nothing? What

This is exactly the same argument that Bill Gates used in 1976 in "Open Letter to Hobbyists", asking: "Who can afford to do professional work for nothing? What hobbyist can put 3-man years into programming, finding all bugs, documenting his product and distribute for free?" Here we are, nearly 40 years later, standing next to Wikipedia, OpenStreetMap and all the open source software in the world, and we can say, Yes, people will do this work for free. The fundamental premises of your argument (that people won't do it for free) has been disproved.