If I remember correctly, changing RoF figures for artillery pieces and then running them through the cost calculator, doesn´t affect their cost.
So when I tried to make PzH2000 a bit more realistic (my opinion

) and RoF to 8, I got myself almoust double the firepower at the same price. I have no idea how to value this increase. (So I added roughly 50% to the cost).
More rounds in a target per minute is SO much better than the number of salvos. Especially true in real life.
Any ideas?