I think ULA prefere the term
reassuringly expensive.
Seriously, unlike a lot of other DoD payloads GPS sats are not a $Bn 1 off that absolutely, positively, cross-my-heart-and-hope-to-die have to work packages. the incremental cost of building another one if there's a launch failure is not that high.
Of course if SX manages to launch all the GPS satellites without failure people might begin to ask what exactly requires so much money to get the level of reliability that ULA have delivered.