People really think DARPA is all about the money at is thrown at it, but they overlook how DARPA technology actually gets integrated into the civilian market. You've all heard, "technology X can do anything except leave the laboratory." But manufacturers can sell technology to the military at much higher prices then they can to civilians. So manufacturers work out the kinks in their processes while selling to the military then they have a product they can actually sell at a scale to make a profit. The UK's biotech industry works a lot of the same way, with the NHS being pipeline for cutting edge technology to be supplied to the masses.