Just compare Falcon Heavy with the Space Shuttle.
53 tons to LEO ?
STS could carry 25 tons.
FH quoted @ US$ 135 million for over 6.4tons to GTO (about 20tons to LEO and over, probably threshold for cross feeding).
Still 1/10th the cost.
Much like F9 v1.1 vs Delta 4, 1/10th the cost.
Bottom line is STS was as much as ULA pork/jobs programs is today.
Economically it was a Dinosaur. All the fuss about the project being suspended and resumed might have reduced the cost by 10 or 20%, but it would still have been uneconomical.
Govt workers don't care about govt money. Its not their pocket. Quite differently from Elon's decisions on SpaceX. ULA cares about its profits, with cost+ contracts, it ends up being just the same.