I never said it was free. But end costs are the factor. 1Billion+ per B2 is not reasonable and how did that happen? 25 units.
If you need special air-conditioned hangars to maintain each aircraft, then well, it will be expensive regardless of how many you build. Guess why the B-52 is still around and bombers like the B-58 Hustler are not. The whole B-2 program was a disaster in terms of upkeep.