"Every kilogram of fuel you save is extra profit" - which is sort of correct, in a roundabout way, via the https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equa

"Every kilogram of fuel you save is extra profit" - which is sort of correct, in a roundabout way, via the https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation : more fuel -> more weight -> need for even more fuel -> even more weight, which is the actual limiting factor in getting to LEO. So, a better way to put it would be "every excess gram severely decreases your range. Oh, and everything counts, fuel included."