Earlier quoted context omitted.
And? What do you think they're spending those billions on? Giant computing centers in Utah and all the signals intelligence the entire country does --- all the satellites, all the underseas cable taps, all the deployments of hardware implants on Chinese military computers. Exploit development is a rounding error in that budget.
Satellites and undersea cable taps fall to the NRO and the USN, though I'm sure the NSA pays for some of it. That is beside the point though, the issue is exploit to hardening ratio - not exploit to everything-else ratio.
Is the money being spent wisely? Different question. But: nobody really knows how to effectively spend 100MM on hardening (a nice round number I picked at random).