It's also about what the aircraft do. The expensive flashy few B-2s and F-35's go in and take out the enemy's radar and flashy fighters, then the fleet of B-52s and F-16s go in and wipe out everything else.
WHen ordering prototypes, they'll usually order one for performance testing, and one for destructive testing. One to see what it can do, and one to find out what it can't do. Much better to do it that way than to order 500 and find out none of them work.
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