What about cost per hour to fly? or to maintain? How do those fast jets and tactical bombers compare to the A-10?
I have seen costs at $20 - $40K per hour for a B-1, which is probably 2 - 3 times that of the A-10 but all CPFH should be taken with a pinch of salt.
The B-1 can carry 2 - 3 x the ordnance, though, get there quicker, orbit out of air defence range and stay on station for longer.
I am not suggesting that the B-1 is the ideal aircraft for this, just that it turned out to be the most used.