Keeping an F-117 flying and stealthy is a monumental and incredibly expensive task.
I'd almost agree, but they're not flying all 64 planes built--maybe at most 3-4 planes, primarily for providing "targets" for radar systems research on behest of the DoD and defense contractors who build radar systems like Raytheon and Lockheed Martin. Because of the very small number still flying, the planes could have been subject of "black project" upgrades increasing its stealthiness and may be still operational on highly-classified combat missions.