Yea of course, we talked about on our server as playing last night. We came to the conclusion that it should be per planet, stone for Nauvis of course.
For Vulcanus, sulfuric acid and water don't play very well with each other in real life, so we can use water. This means that you would need, "a violent reaction to pump more yield of sulfuric acid from this planet."
For Aquilo, you do have crude oil. Since the planet is cold, freezing actually, I mean liquid ammonia is stored -33°C and it has seas of it.. You could use steam to able to, "loosen the freezing bonds of the planet to allow better yields of a deeper reserve". And as everyone knows, that's going to fun to do because this planet wasn't made for the weak. Haha
