The government doesn't have to subtract overhead from the gross and end up with a net income like a private individual or business does. Every dollar coming in is net profit. They can spend $10 of your money to put a dollar in their pocket. That dollar is 100% profit to them.
I'm handing out badge rep like candy today. For those of you who deserve it but didn't get it, I'm probably rationed from giving it to you. (I'm talking about you, level.eleven.)